I'd like to know the same things.
Can I disassemble my wiring harness, (removing all of the wires I don't need) and reflash my ecm to work without everything that I deleted?
My donor was a 2010 srt8 Chally 6 speed and I'm using everything.
I think that's basically what Hotwire does. I have no idea how to reflash an ECM, but the wiring harness would be easy to modify. Just takes a little time and patience.
