You can already pan with MMB at the moment, although I don't know if it will actually work now after the zoom was implemented.
I do want to add a toggle to reverse alt+LMB and LMB, so that marquee is done with LMB, and camera panning is done with alt+LMB, which is more similar to how Unity handles their viewports

<3

Also, it's out now, in case you didn't know :)

I think I got what the issue is now, thanks for the images!

I'll probably do this at some point, though I think I would prefer to not have to. Nested nodes should serve pretty much the same purpose, when that is implemented, I hope

The wire routing is something I will polish and work on every now and then!
It's hard to make a routing system that fits all given occasions, but I do have plans for a more flexible system, which wouldn't share the same issues as the current one.

Routing nodes may be possible, but I think I would prefer to have a system that looks nice without them. Routing nodes seems to me like a way of pushing responsibility of node routing to users, rather than just fixing it myself :)

(Also, please keep it to one request per thread)

The PBL system is going to be reworked to fit Unity's upcoming PBL implementation, which means this ultimately depends on if they're going to have a metalness system or not