Hi: While force fins are great in still water in a pontoon boat they would be a dead loss in rivers of any speed. You can turn the boat quickly to avoid things like sweepers and rocks and I dont believe you could make sufficient headway upstream to pull plugs properly.
I tried it in a Bucks and it dident work worth a darn.
What I did find is that the boat will drift along at just about the same speed as a dry fly so you can get good onepass coverage along the shorelines..If you raise a fish you can always pull over to shore ,anchor and work the area over thoroughly.
coot