https://github.com/keirf/FlashFloppy/wiki/Hardware-ModsEverything you folks want to know about mod wise is there. Scroll down for info on the screen replacement. You mad need some hot glue to hold it in to place as it is a little bit wider than the default numbered display.
The screen costs a few bucks on ebay, same with the rotary encoder. What I like about the encoder is that it has a 'built in' tact switch so after you are done cycling through the images you want, press in to the encoder and it will click. There is also a way to use a blackberry trackball which I find kind of amusing.
For those with hXc, I believe he has issued a newer firmware update that you can put on your usb drive and upgrade to in order to enable the use of the mods listed above.