I may cut off my input/output/mic wires as well. The way I mounted it, they aren't really in the way, but I think I used the input once for attaching an iPod 160GB to, way back when I first bought it and haven't used them since.The wires were too bulky and it was hard to find space to tuck them out of the way, wasn't using them so I used side cutters to remove them!
I just use the power to power my 595, that's all I need. Audio out is just bluetooth to my Cardo on my helmet and I removed the microphone from that because it was a nuisance with my flip front helmet and I wasn't using it.
The USB was so long I was able to feed it back to the rear toolbox, so that is what I did with it. I just use it to charge the battery that I use to charge the phones at night while camping.
As for the BMW Heated gear, I haven't seen any gear from them that doesn't use the Powerlet/Helli port or the standard Gerbings coaxial, but I am not that familiar with their stuff either.