No function to disable/leave the mode

[andrelkin]

I could not restore back to my original mode-line after I attempted to try out the package.
I think it should have an exit function.

[sheijk]

Same here. I see slowdowns in sml/generate-modified-status and sml/generate-minor-modes for some large files so this would save me from having to restart Emacs

[sheijk]

Also #66 seems to be a duplicate of this