But I think I've gone as far with it as I'm going to.
1. If dual is even possible, it looks like it would involve creating a second map for my CH controls and I know that can be done but don't know how to do it. (I had to follow a video tutorial to set it up the first time and now I don't recall how it's done.)
2. Once before when I fiddled with my CH controls, I had to reload the game to get them working. Don't want to risk going through that again.
3. Today was my wife's second day flying ROF and we seem to be getting by without dual controls. We take turns in the seat; I'll demonstrate level flight, a coordinated turn, or something like that; then we'd swap and she'd do what I did. Worked pretty well. Tomorrow I'll have her working on GRM's like turns around a point and we'll take it a step at a time beyond that. So dual controls are no longer an idea we're working on.
But as you say, it is an interesting concept. Maybe someone more adept at setting up CH control maps will try it sometime. But as for me; I'm done with it.
This is a very interesting idea! Please keep us posted!