More intuitive block navigation

Thanks for that @SirCaptain , but ideally you should make 1 post per request, to help out the devs parse it.

I made some comments below. I also mention some existing posts that already might address some of your requests (if they do, please vote on them!).

I like that. Even better, CTRL ± to unfold/fold next/previous levels.

Might be best to add this to one of the existing posts regarding multi-block selection.