diff --git a/README.md b/README.md
index a863aa8..839a43e 100644
--- a/README.md
+++ b/README.md
@@ -29,6 +29,8 @@ This project currently only supplies a single Packer template (`template.json`),
 
 OS X's installer cannot be bootstrapped as easily as can Linux or Windows, and so exists the [prepare_iso.sh](https://github.com/timsutton/osx-vm-templates/blob/master/prepare_iso/prepare_iso.sh) script to perform modifications to it that will allow for an automated install and ultimately allow Packer and later, Vagrant, to have SSH access.
 
+**Note:** VirtualBox users currently have to disable Remote Management to avoid [periodic freezing](https://github.com/timsutton/osx-vm-templates/issues/43) of the VM by adding `-D DISABLE_REMOTE_MANAGEMENT` to the `prepare_iso.sh` options. See [Remote Management freezing issue](#remote-management-freezing-issue) for more information.
+
 Run the `prepare_iso.sh` script with two arguments: the path to an `Install OS X.app` or the `InstallESD.dmg` contained within, and an output directory. Root privileges are required in order to write a new DMG with the correct file ownerships. For example, with a 10.8.4 Mountain Lion installer:
 
 `sudo prepare_iso/prepare_iso.sh "/Applications/Install OS X Mountain Lion.app" out`
@@ -40,7 +42,7 @@ Run the `prepare_iso.sh` script with two arguments: the path to an `Install OS X
 -- Done. Built image is located at out/OSX_InstallESD_10.8.4_12E55.dmg. Add this iso and its checksum to your template.
 ```
 
-`prepare_iso.sh` also accepts three command line switches to modify the details of the admin user installed by the script.
+`prepare_iso.sh` accepts command line switches to modify the details of the admin user installed by the script.
 
 * `-u` modifies the name of the admin account, defaulting to `vagrant`
 * `-p` modifies the password of the same account, defaulting to `vagrant`
@@ -50,6 +52,11 @@ For example:
 
 `sudo prepare_iso/prepare_iso.sh -u admin -p password -i /path/to/image.jpg "/Applications/Install OS X Mountain Lion.app" out`
 
+Additionally, flags can be set to disable certain default configuration options.
+
+* `-D DISABLE_REMOTE_MANAGEMENT` disables the Remote Management service.
+* `-D DISABLE_SCREEN_SHARING` disables the Screen Sharing service.
+
 #### Clone this repository
 
 The `prepare_iso.sh` script needs the `support` directory and its content. In other words, the easiest way to run the script is after cloning this repository.
@@ -118,6 +125,14 @@ VirtualBox support is thanks entirely to contributions by [Matt Behrens (@zigg)]
 
 ### Caveats
 
+#### Remote Management freezing issue
+
+The default `prepare_iso.sh` configuration enables Remote Management during installation, which causes the resulting virtual machine to [periodically freeze](https://github.com/timsutton/osx-vm-templates/issues/43). You can avoid enabling Remote Management when using `prepare_iso.sh` by passing `-D DISABLE_REMOTE_MANAGEMENT` this:
+
+```
+sudo prepare_iso -D DISABLE_REMOTE_MANAGEMENT "/Applications/Install OS X El Capitan.app" out
+```
+
 #### Shared folders
 
 Oracle's support for OS X in VirtualBox is very limited, including the lack of guest tools to provide a shared folder mechanism. If using the VirtualBox provider in Vagrant, you will need to configure the shared folder that's set up by default (current folder mapped to `/vagrant`) to use either the `rsync` or `nfs` synced folder mechanisms. You can do this like any other synced folder config in your Vagrantfile:
diff --git a/prepare_iso/prepare_iso.sh b/prepare_iso/prepare_iso.sh
index 5e6d4d5..d2ce7fa 100755
--- a/prepare_iso/prepare_iso.sh
+++ b/prepare_iso/prepare_iso.sh
@@ -31,8 +31,8 @@
 usage() {
 	cat <<EOF
 Usage:
-$(basename "$0") [-upi] "/path/to/InstallESD.dmg" /path/to/output/directory
-$(basename "$0") [-upi] "/path/to/Install OS X [Name].app" /path/to/output/directory
+$(basename "$0") [-upiD] "/path/to/InstallESD.dmg" /path/to/output/directory
+$(basename "$0") [-upiD] "/path/to/Install OS X [Name].app" /path/to/output/directory
 
 Description:
 Converts an OS X installer to a new image that contains components
@@ -49,6 +49,11 @@ Optional switches:
   -i <path to image>
     Sets the path of the avatar image for the root user, defaulting to the vagrant icon.
 
+  -D <flag>
+    Sets the specified flag. Valid flags are:
+      DISABLE_REMOTE_MANAGEMENT
+      DISABLE_SCREEN_SHARING
+
 EOF
 }
 
@@ -85,7 +90,11 @@ USER="vagrant"
 PASSWORD="vagrant"
 IMAGE_PATH="$SUPPORT_DIR/vagrant.jpg"
 
-while getopts u:p:i: OPT; do
+# Flags
+DISABLE_REMOTE_MANAGEMENT=0
+DISABLE_SCREEN_SHARING=0
+
+while getopts u:p:i:D: OPT; do
   case "$OPT" in
     u)
       USER="$OPTARG"
@@ -96,6 +105,15 @@ while getopts u:p:i: OPT; do
     i)
       IMAGE_PATH="$OPTARG"
       ;;
+    D)
+      if [ x${!OPTARG} = x0 ]; then
+        eval $OPTARG=1
+      elif [ x${!OPTARG} != x1 ]; then
+        msg_error "Unknown flag: ${OPTARG}"
+        usage
+        exit 1
+      fi
+      ;;
     \?)
       usage
       exit 1
@@ -210,7 +228,11 @@ USER_GUID=$(/usr/libexec/PlistBuddy -c 'Print :generateduid:0' "$SUPPORT_DIR/use
 
 # postinstall script
 mkdir -p "$SUPPORT_DIR/tmp/Scripts"
-cat "$SUPPORT_DIR/pkg-postinstall" | sed -e "s/__USER__PLACEHOLDER__/${USER}/" > "$SUPPORT_DIR/tmp/Scripts/postinstall"
+cat "$SUPPORT_DIR/pkg-postinstall" \
+    | sed -e "s/__USER__PLACEHOLDER__/${USER}/" \
+    | sed -e "s/__DISABLE_REMOTE_MANAGEMENT__/${DISABLE_REMOTE_MANAGEMENT}/" \
+    | sed -e "s/__DISABLE_SCREEN_SHARING__/${DISABLE_SCREEN_SHARING}/" \
+    > "$SUPPORT_DIR/tmp/Scripts/postinstall"
 chmod a+x "$SUPPORT_DIR/tmp/Scripts/postinstall"
 
 # build it
diff --git a/prepare_iso/support/pkg-postinstall b/prepare_iso/support/pkg-postinstall
index a8a6c3c..a801181 100755
--- a/prepare_iso/support/pkg-postinstall
+++ b/prepare_iso/support/pkg-postinstall
@@ -9,17 +9,19 @@ if [ "$OSX_VERS" -ge 10 ]; then
     OVERRIDES_PLIST="$3/private/var/db/com.apple.xpc.launchd/disabled.plist"
     $PlistBuddy -c 'Delete :com.openssh.sshd' "$OVERRIDES_PLIST"
     $PlistBuddy -c 'Add :com.openssh.sshd bool False' "$OVERRIDES_PLIST"
-    $PlistBuddy -c 'Delete :com.apple.screensharing' "$OVERRIDES_PLIST"
-    $PlistBuddy -c 'Add :com.apple.screensharing bool False' "$OVERRIDES_PLIST"
+    if [ __DISABLE_SCREEN_SHARING__ = 0 ]; then
+        $PlistBuddy -c 'Delete :com.apple.screensharing' "$OVERRIDES_PLIST"
+        $PlistBuddy -c 'Add :com.apple.screensharing bool False' "$OVERRIDES_PLIST"
+    fi
 else
     OVERRIDES_PLIST="$3/private/var/db/launchd.db/com.apple.launchd/overrides.plist"
     $PlistBuddy -c 'Delete :com.openssh.sshd' "$OVERRIDES_PLIST"
     $PlistBuddy -c 'Add :com.openssh.sshd:Disabled bool False' "$OVERRIDES_PLIST"
-    $PlistBuddy -c 'Delete :com.apple.screensharing' "$OVERRIDES_PLIST"
-    $PlistBuddy -c 'Add :com.apple.screensharing:Disabled bool False' "$OVERRIDES_PLIST"
+    if [ __DISABLE_SCREEN_SHARING__ = 0 ]; then
+        $PlistBuddy -c 'Delete :com.apple.screensharing' "$OVERRIDES_PLIST"
+        $PlistBuddy -c 'Add :com.apple.screensharing:Disabled bool False' "$OVERRIDES_PLIST"
+    fi
 fi
-# Placeholder for Remote Management
-echo "enabled" > "$3/private/etc/RemoteManagement.launchd"
 
 # Add user to sudoers
 cp "$3/etc/sudoers" "$3/etc/sudoers.orig"
@@ -29,6 +31,7 @@ echo "$USER ALL=(ALL) NOPASSWD: ALL" >> "$3/etc/sudoers"
 USER_GUID=$($PlistBuddy -c 'Print :generateduid:0' "$target_ds_node/users/$USER.plist")
 USER_UID=$($PlistBuddy -c 'Print :uid:0' "$target_ds_node/users/$USER.plist")
 $PlistBuddy -c 'Add :groupmembers: string '"$USER_GUID" "$target_ds_node/groups/admin.plist"
+
 # Add user to SSH SACL group membership
 ssh_group="${target_ds_node}/groups/com.apple.access_ssh.plist"
 $PlistBuddy -c 'Add :groupmembers array' "${ssh_group}"
@@ -36,10 +39,12 @@ $PlistBuddy -c 'Add :groupmembers:0 string '"$USER_GUID"'' "${ssh_group}"
 $PlistBuddy -c 'Add :users array' "${ssh_group}"
 $PlistBuddy -c 'Add :users:0 string '$USER'' "${ssh_group}"
 
-# Configure user with full Remote Desktop privileges
-$PlistBuddy -c 'Add :naprivs array' "$target_ds_node/users/$USER.plist"
-$PlistBuddy -c 'Add :naprivs:0 string -1073741569' "$target_ds_node/users/$USER.plist"
-
+# Enable Remote Desktop and configure user with full privileges
+if [ __DISABLE_REMOTE_MANAGEMENT__ = 0 ]; then
+    echo "enabled" > "$3/private/etc/RemoteManagement.launchd"
+    $PlistBuddy -c 'Add :naprivs array' "$target_ds_node/users/$USER.plist"
+    $PlistBuddy -c 'Add :naprivs:0 string -1073741569' "$target_ds_node/users/$USER.plist"
+fi
 
 # Pre-create user folder so veewee will have somewhere to scp configinfo to
 mkdir -p "$3/Users/$USER/Library/Preferences"