Ah OK, something I'd suggest is havingg the ability to sort different. The current is everything alphabetical. i'd much prefer folders->misc files. Admittedly I've not yet organized my stuff yet but it's still a bit weird looking.
Also I'll try to do it with various roms, the last thing is that the scaling filter that's used is a bit odd. Maybe try doing something like bicubic filtering on the thing to make it a lot clearer(GB games). GBC the default full screen is just fine, and so is the 3x +0.75x one. But yeah bicubic filtering on the images would defintiely greatly make the thing look a lot better on my screen.