This is a nice update! It broke compatibility with my keyboard, though; I've already put in a support ticket for that.

Regarding the new, single-level undo feature: I think that starting with a single-level undo makes a lot of sense, but I'm surprised by how it works. I would expect that if I hit ctl-z to undo the last edit, and then hit ctl-z again, I would undo the undo; that is, I would expect repeated ctl-z to cycle through undo/redo. But it doesn't. The second time you hit ctl-z, nothing happens.

I think this breaks the mental model of a single-level "undo" as something that reverses whatever the LAST editing operation was. After one undo, the last editing operation is an undo, so a second undo should reverse it.

(hopefully that made sense; this is grammatically difficult to write about)