Yep - already done.

I'm actually using channel one for output 1/2 from the sound card, and channel 4 for output 3/4 from the sound card (cue).
Channels 2/3 are mapped to the software as well as the crossfader section. Well, mapped and I already have feedback LED's in the crossfader section (I used that for kills), and just mapped for the channel strips.
I'm toying with the idea of using the sampler section but I'm not 100% on how I'm going to use that most effectively.
Still have P1-P3 to map - I currently have them mapped to load audio/video using the mode button to determine which but that will likely change tonight as I work with it more.
Once I'm done I may post the mapping if anyone is interested...
I initially set up the sampler dial to select the video transition - but like I said, I'm not 100% I'm going to use it yet.