Steven, of course I can temporary return old command description to user be able yo clear hotkey for it, but I think there is need for universal solution. Maybe its worth to get user opportunity to assign hotkey which is used by inactive (or obsolete) command? Hotkey for inactive command should be cleared in this case.
There should be no unassignable hotkeys beyond the user's control. Currently the only solution is manual editing of the settings file like this.
Edit: finally fixed it with the ini.
<Key>131139</Key>
<KeyCommandPair>
<Key>196673</Key>
<Command>EditCopyAll</Command>
<IsGlobal>false</IsGlobal>
</KeyCommandPair>