So, I'm a last 2 days backer and glad we reached DM mode, to be franck.
I miss NeverWinter Nights and its DM mode. I don't think we have had any such mode on any game ever since.
I'm looking forward to seeing what Larian is gonna come up with on this front. Hopefully, they'll start by NWN1, which was easy to use. That's the key thing, here: easy. If you need to be a pro computer artist to be able to modify something, that won't work IMHO.
Anyway, just a heads-on ...