Tom-
I had one of those Cabela's trolling plates you noted.
Worked pretty good on my old Evinrude 90, but was somewhat of a pain to remember to release the mechanism when locked in the up position ( to get the plate down to troll), and if you left it in the down position and took off at 1/2 or more throttle, it would shear one of the brass sheer pins and you had to take 10-15 minutes to replace the pin, which required going ashore or to a dock.
It's also hard to get exact control of your trolling speed with a trolling plate and a big outboard. Certainly not very stealthy, either!
Ultimately, the main hold back plate developed fractures in the plastic casting, and it now sits out in my RV barn.
I'm not convinced lower pitched props are the answer, either. The boat is so easily driven at 1-3 mph that the lower pitched prop just slips less, easily going 2,3,4 or more mph.
Maybe the bucket draggers do have the KISS solution, after all!
I still like the Engine Mounted Trolling Motor, but it requires lots of battery power, and only works on inland lakes or situations with little wind, current, and from 0-2 mph (or 3-4 with a BIG thrust/high amperage electric motor.)
Joe. :teeth :thup