True.
But you can do it for the mute button, as I have(it says: "muting").

BTW: I have a bunch of wav files on my remote, but conservately placed.
I do them for MAJOR operations.
Main Power buttons(punch through from Watch power macros, which plays wav, turns everything on, off, etc.), Watch/Listen button activity buttons("Watch cable TV", etc.), selection confirmations("CD/DVD is being selected", "music channel selected", "FM/XM station selected", etc.), REC( "Recording", I wanted to do a confirmation for the REC, it's also a multi step macro ) and mute(punch through from AVR macro, which plays wav: "muting", since this is a toggle and "muting" covers both since you can't have mute on/off, and exucutes mute on AVR), etc.
NOT everywhere.
Plus I have a ton of neat graphics, null devices, nested macros, etc.
But yet my remote only shows 60-70%RAM 9-12% MEM, with plenty of room for tons more CD/DVD selections and devices, with all of the main wav files/devices, macros,etc., there.
I made sure I didn't go overboard, but yet have a good amount of WOW factors.