Total Commander

Once a compare is done, it would be good for the [Compare] button to be disabled - unless one of the arguments is changed.
Maybe I'm the only brain-dead guy around, but when I compared giant directories or drives, and I left the PC to run its compare, more than in one occasion, upon returning I clicked [Compare] again instead of the [Synchronize...] button. (Yeah it just happened... again.)

Support. But only for cm_FileSync, not for TC.exe /S=S.

Though I understand the request, I strongly recommend to make such a feature optional. Changes made to the compared directory structure externally, e.g. by another TC instance or a background program, may warrant another comparison run.

To all three:
Support. Support. Support.