I've been wanting this forever and just worked around it. So silly I pushed it off this long, it took me like 20 minutes tom implement.
All my users rejoice! You can now append -- to run and dryrun and all args following will be forwarded to the task (i.e. appended with spaces in between)
You can even forward a double dash if the task supports that:
stask run a-task -- -- foo bar
This will result in the following being executed (assuming a-task i just the exe a-task):
a-task -- foo bar