I do feel bad for you guys trying to wade on those lower flows, I was with you until buying my boat last year. It seems that every boat runs from rebar hole on up on the outlet side of the river instead of giving those waders a little room. I know the channel runs over there but there's no reason most boats can't run mid-stream at least through there.
A no wake zone would be nice up there but I think it could start at the boat ramp as opposed to outlet #3. Most of those boats would shut down there as opposed to running at low speeds the rest of the way.
When I started boating on the rivers I had several questions relative to boating etiquette specifically on tailwaters. There aren't many resources available but I did locate a great post on another regional fly fishing site that answered most of my questions. We could start a thread here with the un-spoken rules of the river to help any new/uneducated boaters out.