Thanks to your suggestions we have added Rudder Effectiveness and Single I/O Prop Walk.
You can now select low/medium/high rudder effectiveness from the start menu. Be sure to refresh your browsers on the menu page and then again on the simulator page.
For a single I/O with an engine speed of 600 RPM, the engine in reverse, and the rudder turned hard port/starboard, the boat will move in the direction of the rudder.
Please let us know how the changes work for you.