The two most important, most accessible gestures in Open Gesture are the ones that are not covered up by the gestures area. I'm talking about the up swipe and the down swipe that work before the gestures area is brought up.
Right now you have decided what the up swipe will be. I have no choice but to accept your decision. On the down swipe, I have some choices. The choices I have are different than the choices I get for other gestures, and not as complete.
I want to put my own apps, or shortcuts, or whatever, on these two most convenient gestures. What is wrong with that? It shouldn't be hard for you to program this. You can list the two gestures with all the rest in the manage gestures area with some sort of special notation. You should probably make it impossible to delete them as well.
I don't think you really need the settings and device health screens. Maybe they make beginners happy, maybe not. Turn them into apps or widgets and let them slug it out in the Android Market with everybody else's apps and widgets that do the same thing. Have yours installed and selected by default in OG if you want, I don't care about that.
I just want to have my way with your uncovered gestures.