Oh yeah I think I saw that in the Compatibility List a few seconds ago.
I think Sonic Gems Collections might be better of changed to red by now since most of the games are not playable out of the Game Gear ones.
On a side note...
I tried a LOT of different workarounds to get the Digital/Analog triggers mod working.
It does work... But the thing is that I cannot make Mario to run and shoot water at the same time.
He always stops even with the L+ZR combo which makes the value read by Nintendont below FF (I have tried 0x70, 0x80, 0x90, 0xA0 and it is always the same)
Even weirder...
I tried just setting the Full press to 0x80 instead of 0xFF and I STILL get the same response.
I might be overlooking a part of the code that takes effect in this part without me knowing it.