wiring in the HQCT into a mac mini i don't have an answer. from just a quick glance at the unit, it looks like you could take the audio out, wire it into a headphone jack and then plug it in to a unit like a griffin imic, to get the sound into the mini. There may very well be a better way than that, and i may be missing the point completely, I have never looked at the HQCT Module before.
laptop outside of the car, but for some reason would crash every time in the car upon making/receiving a phone call. It has been awhile since i have used it so it could be better now.
good luck with the install!