What I would like to get is ability to program cruise buttons to control stuff, like an air horn, lights and additional function on the radio.
Air Horn set up should be pretty easy if we could open them up and wire a circuit to the button directly, but other stuff should be pretty cool too.
I bought PAC wired steering wheel control interface for my kenwood, and I will end up getting beaten with a stick by JeepJeepster for not installing it yet (Got it in thanksgiving!) So to answer your question, yes you can get wired or infrared steering wheel interfaces, do yourself a favor, go with a Head Unit that has wired steering wheel control input. Otherwise you just have to get a wired Infrared remote control and mount it some place where it can see your H/U.