Anyway these configurable buttons have been discussed to death and it is
clear that they will not be reality, not at least until someone submits a
patch.
Why not make them all configurable, but only editable with an optional
plugin? If a user can find, install and launch a plug, they should be able
to understand what they're doing. If the plug also has a 'reset to
defaults' option, I can't see any support problems. The bootloader could
even have that option in case someone really messed up their layout.
--
gl