Dennis,
I've had the early Roland ones for years before I had a PA arranger, but I fail to see why you don't just record the song as a sequence if you're not going to play it anyway. To clarify ... you want to call up a tune and then just let it do the changes for you ... how's that different from playing a sequence? My opinion is that the c/s is there for when you want an extended solo, or a quick track that requires lots of pitch bend or something like that. I remember a friend who used an early Casio with a similar record feature and he'd play the whole tune as he sang or played the melody, then he'd hit the button and pick up his trombone and walk around the room playing over the changes. That's a great example of how to use it smartly.
I mean no disrespect to you ... but it sure sounds like you want a sequence. Why not just MAKE one?
Like Denzel said to Tom ... "Explain it to me like I'm a six year old..."