we are also thinking to use a omni wheel design this year as well (also a dream of mine lol
) and we have decided on a two joystick operation. (as people of said, one joystick controls forward backward and strafing, whilst the other comtrols rotation)
The main reason we went with two joysticks is because some of us one the team play First Person Shooters a lot. So this style of controlling works well with us. causes thats how we would play a FPS.
I don't know if that helps at all but that was why we chose to make ours two joystick.