In the later parts of the game when you're cycling Alkahest, it would be great if there were something you could click that would prevent anything from leaving the Central Circle.
The startup sequence is a very cool concept, but right-clicking a bunch of machines so they'll stop eating my elements then finding them all to click again eventually got tiresome, and it seems that just restricting things to the outer circle (the one with e.g. the Volcano) would cover it without messing up the core design.