I wasn't getting ore faster than just holding, so sounds like that is working properly.
I did turn the UI zoom up, but only to where it was reasonable to read. Higher might work better, there's definitely room for it.
An undo function isn't entirely what I mean, I'm just looking for things to not fall as soon as I click. I can grab structures and place them without them falling until I move, but if I click a structure to move it
As an example, in the attached pictures, I right clicked part of the bottom frame, and everything fell immediately. I would only want this to happen once I actually move what I grabbed. Specifically for the case where I grab something and then go "hmm, nevermind".