[deleted] f you wish to undo the changes,
There seems to be little reason to undo something that hasn't actually changed anything. As my arm continues slowly to heal, before too long I'll be able to reach the laptop on its stand, and type on it the way I always have done. I can keep this keyboard as a spare for the media computer. Until then, I'll just put up with restarting the laptop when I need to, and have a lot of typing to do.
Thanks again for your help. If you happen to think of anything else I should try, please let me know, but otherwise I'm going to just deal with it as best I can for now.