I started looking into this a bit more.. Looks like there's a 4 position switch that controlls channel selection. It would be relatively simple to put in a PIC to control switching through channels. A circuit similar to this
http://www.qsl.net/kd2bd/vor.html could be used to detect the valid video signal, then stop on a channel until sync is lost..
Any good electrical engineers out there? I can spec it out, but I can't put a circuit together worth a damn...