Is the "Theme Version" on the bottom of the main ATVO window a scripted theme only thing? Or is it possible to change that somewhere? Would be really helpful to quickly glance and see what version of the theme was loaded instead of having to go back to the file name or have to name the file with the version number at all.

It's not being used for Theme Editor themes at the moment, but it could be a nice feature indeed. I'll see if I can add that!

+1, I've been working on a theme that's used by multiple people so making sure everyone's on the right theme version would be super helpful.