As for selecting rings, perhaps if you tap on one, then drag your finger left or right, it selects the ring next to the one you hit?
Interesting idea, but consider Hard mode where each ring is only about 16px thick. On a small screen, it's going to be difficult to select even the initial ring with any great degree of accuracy, not to mention that I think GM Studio makes you define specific regions for "clicking" instead of direct "Left Click" on objects, so basically what I'm getting at is that it doesn't seem practical with the way the system is set up.
It's not entirely clear what buttons do until you press them.
The idea of labeling buttons has been brought up a couple times before. Between releases I added these to fade in on mouseover, which looked rather nice, but remembering that Mouse Enter/Exit functions are useless for mobile, I removed them again.
Tonight I put them back in simply as static labels (LEFT). There will be a button under Help that will let you toggle them (RIGHT). EDIT
Addressing ring selection in mobile, I've worked up a solution. You swipe your finger (or drag with left mouse button pressed) across a slider bar, and your position determines which ring is selected (the left end selects the outermost ring, the right end selects the innermost ring, and everything in between). It's working quite nice, actually.
Edited by Piemaniac, 14 August 2012 - 10:15 PM.