JegHegy, why don't you just use the L and R buttons? I don't even touch the bottom menu while playing on gp32 unless I'm using an Item I already have. But you sometimes have to hit the buttons a couple times and go back and forth (hit L-R-L) but is quite easy once you get used to it!
As for weird ideas to implement, a cd attachment for gp32 so that I could play full throttle (not serious, as I don't think anyone would go for this but would be a good accessory for gamepark to make! Hell, I'd pay an extra $50-75 for a cd player to use with a gp32, like having a discman with a cord to connect to gp32 imagine what you could do with that with supporting emus/games/movie player/mp3 player)
Ah, I just thought of something useful switched stereo (and an option to revert back to normal) like in doom so that if you play on gp32 speakers it's correct and if you play with headphones it's correct. I'm not sure if Scumm games are stereo though.
Or maybe the ability to remember the last save for the chosen game and boot straight to where you were last playing.
I don't care if any of these actually make it in just thought I'd try and help. Well, thanks for your/Ph0x's work and I hope it progresses into an excellent piece of software!