Sweet. So have you been able to actually hack and re-load head unit firmware? Or just the information that ACDrive sends to it?
If you can figure out a way to activate playlist number searching in playlist mode I'll be happy with the USB functionality and ignore all the rest.
How it works on the phatbox is you simply type the number on the remote and hit 'next disc' and it goes to the number you typed. In ACDrive you can do that with artist, album, or track but not playlist.
Why they removed that function I do not know, but I've never even used VIOT or SSA because I find that to be easy enough.