I recently upgraded from iRiver H120 to a Gigabeat F40. And just went through most of the plugins to check them out.
The one thing I noticed is that there is various different mappings. Like to quit a plugin, I see it either POWER, MENU or A (strange way to quit IMO).
The usual mapping I noticed is POWER to quit immediately (or quit+save immediately), MENU to provide a settings/options and the other buttons to provide plugin control (volume +/-, A, SELECT).
With the iRiver I never noticed this because all I play is Sudoku

.
Just wondering is there a standard in the mapping? As I plan to eventually learn how to make a plugin.