Most of those things Al suggested are already in place in areas that are in Mark Twain forest, and I don't believe any more permits will be issued to new operations. I am limited to 120 boats at our main put in site in National Forest, but I can put in as many as I want from my campground to my take out. National Scenic Riverways are all limited, although the limits are obviously pretty high. We are required to have outfitter stickers and numbers on each vessel. We know our picky landowners on this river and have told them to get a number from any problem floaters and we will deal with them, water patrol also uses these numbers to keep track of illegal activity so they can issue tickets.
On rivers with only private put ins and takeouts, or on MDC areas I don't think there are any regulations,