I have been playing around with this Super Retrocade for a few months now, and thought I would throw in my 2 cents. I currently have a dedicated SD card for arcade games. Then I have a 2nd SD card that has SNES and Genesis. I dont know if this was previously mentioned, but if you want to separate how the games appear, you can:
1) do a quick format on your SD card.
2) on your PC, sort the games by type
3) now select all your Genesis games, & copy them to the SD card
4) now select all your SNES games, & copy them to the SD card
5) finally, select all the image (png) files, & copy them to the SD card
6) when the SD card is read by the Retrocade, it will show thumbnails of all the Genesis games first, followed by all the SNES games
This is just a quick trick to have the games appear, sorted by system.
Also, the new Genesis & Saturn controllers recently released by Retro-bit ( http://retro-bit.com/sega-collaboration), work awesome with the Super Retrocade!