As far as breaking follow.

Have a mapped key, that executes on press or release.
Give it a hotkey.
Set the option to Hold Keystrokes while Key is Held.
Step 1 - Send down arrow or whatever... I have one that does IWT.
Step 2 - For the IWT one, send down arrow; wouldn't need anything here, for the mapped key that is Down Arrow in step 1.

Basically press the key and hold it.
And the action (IWT for me) lasts as long as you hold the key.
And once you release it, it stops doing whatever or sends a directional key which breaks the auto movement from /Follow or IWT or whatever.