Can I drag in multiple sources onto the time line at once (and perhaps choose whether they are put onto a track end to end or vertically arranged on multiple tracks)?
Nope. We deliberately decided to make drag-n-drop a simple, dialog-free experience.
If you want control over importing etc. you need to use the import dialog, which provides all kinds of control (some might even say too much control).
OK, thanks. It’s not critical but just checking to see if I had missed something.