Yes, I forgot about the one with an android device hooked up through the RCA - but this is configuration more for show-off than interaction - unless you mount the device so that you have access to the display of the unit (not like the guy who had it in his glove box showing live engine data through it) - but then why have a nice display on your head unit in the first place?
I agree, an advanced app mode for a more universal interaction with android devices would be cool - It's too bad that only the appradio 2 works with android in appradio mode.