I know this thread if way old but I finally moved to Gens11svn341 so I thought I should say something. Thanks for adding the pink background by the way, it's really helpful.
One feature that's missing and already requested on the Project page for the emulator is the ability to change values in memory. You have this great RAM search window but the button to create a code from an address is not active. I can manage thanks to Lua scripting and/or Cheat Engine, but it's really a weird omission.
I also noticed the screwed graphics in Genesis Savestate Viewer, but I guess we'd need to ask the author of that utility instead.