As commercial trips get in the way of private boaters so do private boaters get in the way of commercial trips.
I used to get bent out of shape everytime Buffalo Joes commercial guides would "bump and grind...push and shove me" up on the Ark, after awhile I got over it and realized its the price of doing business on busy water.
Just like the river is dynamic so are the crowds and rubber community, it is what you make it!
If the river was ment for rules and signs, it would look like the interstate with speed limits, merge lanes signs, No U-Turn, Slower Traffic Keep Right etc etc. Don't think you want that.
My rule of thumb is be polite and courtious and considerate of others first and you'll have a great day. Lifes too short to be worried about all this stuff.