I had to copy edited versions of the launcher scripts to change the SDL size to full screen, then enable stretch for each system in mednafen-09x. SG2GG implements two different color palettes depending on the Game Gear operating mode. It also brought Red Book audio to console gaming, which meant excellent soundtracks and voice acting. One of the most important goal is to let the software be easy enough for everyone, even for people with no emulators knowledge, and for people that have no computer-skills, but just want to play their games as fast as possible. Get it from the Shoebill GitHub page, and follow the discussion on E-Maculation.
Zip/fileNotePad++: While F11 is commonly bound to full screen commands, pushing it in mednafen will reset your game.