I’ve found a couple that were re-used. Ctrl-C and Ctrl-S, for instance.
I always thought it would be really cool if the keyboard mapping feature had something that allowed exporting of the key mappings to an HTML table and sorting of the list by keys. That would make it pretty easy to check.
I’m going through and doctoring my keys so that some of the ones that I commonly used for other things do the same thing in Multi-Edit. I just installed the upgrade and managed to wipe out all of my configuration settings. I keep forgetting that ctrl-s, ctrl-f, and ctrl-a don’t do what they do everywhere else. (I hate that!) It’s a pretty tedius process. (This time, I’m making sure that I back it up when I’m done!)