after some efforts[*] at my end, we now support both Game Genie dumps in the megadrive driver, just because we can
Start with 5 lives in Sonic
Start with 5 lives in Sonic 2
Start with 99 lives in Sonic 2 (makes life easier)
Debugger mode in Sonic 2 (so to place any element wherever you want in the levels... a piranha in this case)
Have fun
[*] the "efforts" were made necessary by the fact that Rev. A dump locks the GG ROM in two 8bit writes instead of a single 16bit one as Rev. 0 (and as I was always assuming after reading Charles' docs), and it took me some time to figure out my mistake