+1 trying to come up with a very basic walkthrough workflow but without this it's pretty tough

yes, crop AND MOVE. Let me put two or three talking on heads on screen at the same time.

ideally including similar options like for the picture in picture screen recording + camera

-> circle; square + rounded corners

+1 this also is a feature I'm looking for

Please do this!

As of right now, you're not able to crop videos? Is that correct? If so, I'll stick with Camtasia. So disappointing. My videos are split-screens because I interview people. Thank you.

Some crop presets could include portrait of landscape to fit on a smartphone screen, for example.

Please do this or was it done and I missed it?

Cant over state how much blur and crop would add value - and speed editing for when there is something you want to remove