I tried changing the shortcuts to F9, F10 and F11 on the record, stop and cancel settings. Then When I try changing one of these short cuts to another F key if fails with: Unable to setup shortcuts for Stop Key
Then if you close the program and open it again it will let you change the shortcut key to anything. But not if you want to readjust it without closing the program first to reset something in its memory.
Also it won't let you have more than 1 keyboard shortcut have no shorts attached. Since 2 shortcuts with nothing is the same as 2 shortcuts using F9 or other key. You should be able to change all the shorts to nothing.