Seems like they are out there now. Given that, and that you lose sync with aftermarket deck, and that some aftermarket decks have bluetooth for hand free and all built in......do those interface units make use of ALL the steering wheel controls? I dont want to pick something like that up with a deck with bluetooth and all just to end up with the basic vol +/- and fwd/bck controls working but the phone button and all not. So can they make use of everything there, or would I end up with some dead keys?