Thanks for the inputs Willy and brian, all that will be set with this barrel will be the idle mixtures, idle speed only. I think I've fingered out the WOT setting and will test that one on the pond. I'm doing this this way as a safety thing, even with someone at the helm steering, I'd have to be laying across the rear deck and stretched across the bracket, awkward at best, and then there is the clear and present danger of dropping the tools, never to be seen again
I looked at Tractor Supply and others (TS has one metal container that would make an awesome pool for lounging like I'd be doing, just hook up a sand pool filter and pump, TS would have to deliver it) I didn't really want to spend $150+ for something I'd be using once or very seldom
Oh and while I do realize that in-gear won't be like pushing the boat, the load of the water against the prop is what is needed as the resistance for setting the mixture and idle speed. I did notice on the "splash" day that neutral idle is slightly lower than just in gear idle, thats in the shifter assembly and I won't bother with it (its kinda like when turning your A/C on in the car, something bumps the throttle up to compensate for the load)