Just a suggestion in the program (shouldn't be that hard to implement), but could you make a small change in how MAME game themes are implemented? If you download the theme for 19xx, for instance, 19xx will now have a background but no wheel art. You have to unzip the theme and copy 19xx.png into the \Media\MAME\Images\Wheel folder. Not that this is hard to do, but it's extremely tedious to do every single time just for a single theme. Isn't it a simple matter to change the wheel art for the game to be read as <rom>.png?