I'm now waiting on some fine weather and some free time for sea trials. Full rudder on my Heighton (a Southampton with enlarged rudders) looks slightly alarming at full speed. Tarring (Mountfield's Active) with its big steerable kort never goes fast enough to roll much, but she is a gem at low speed manoeuvering. It will be interesting to see how Denton (ex neddy) performs.
Some TX's have variable end point adjustment (EPA) that lets you match maximum stick movement to a limited movement of the servo. It was trial and error in my case. I started at 80% and kept coming down until the pins stayed in! The only trouble I could see with the mechanical stop is that you could never tell just how much throw you were using and as a result the servo could be pushing hard against the stop without you knowing. Long term, I doubt if that would have been a good thing.
I wanted 6 channel R/C, so I could have two ESC's, then add a bow thruster, fire monitor and maybe a working winch, so I went for the Futaba 6EXA. Being able to set the EPA is a bonus, as is the ability to mix channels, so I can put port and starboard motors on one stick for general cruising, and set this up as a second 'model', leaving the twin stick operation for when I need manoueverability.
Andy