I notice that the menu system doesn't underline letters used for keyboard shortcuts. Even though they seem to be there, it takes a lot of fiddling around to find which one works. Those underlines are a standard Windows interface convention. Is there some reason why they're not shown? For instance, A...

You might also want to check out some of these keypads from PI Engineering:

http://www.xkeys.com/xkeys.php

Those are great: thanks!!