First, single-stage/two-stage triggers give you (with single-stage) a single smooth press with activation point somewhere in the middle, or (with two-stage) a consistent amount of takeup then a wall that you have to break through to activate the mechanism. So you can have the key pressed and resting on the activation point, and then press it the rest of the way when you want the input to register (for instance, if you're in a game and are waiting for someone to peek around the corner).
This is a cool thing, I’d want that on my mouse triggers also. The problem is that in practice it’ll never be what we want it to be because the distance of switches is too small to make that two stage thing be a thing (we’d need super heavy switches for this to be a thing). Now imagine mouse clicks which are supposed to represent a trigger (we operate as if everything is a hair trigger).
Burst/Single burst is mostly a timing thing at this point. Would be interesting to see it become a force based thing.
Fun ideas though.