Cool case!
Here's what I'm using right now:
Show Image
(http://i.imgur.com/rDtSiX9.jpg)
It's pretty mushy feeling though, because I attached the PCB with hot glue. Your case looks much better, I'd love to have one.
I programmed mine to send F17, F18, F19.
And then had KeyboardRemap set it up like so:
Key = Play/Pause, VolUp, VolDown.
Shift + Key = Run/Stop, Step, Skip (XCode Debugger)
Ctrl + Other Key = Switch to Sublime, Switch to Terminal, Switch to Chrome
Cmd + Other Key = Switch to Photoshop, Mouse Sensitivity Down, Mouse Sensitivity Up
I original used states that I could switch to, so it didn't require modifiers - but it was really glitchy.
Dude, that case looks awesome! Funny how do many people use the heart keys