It's one of those things that sounds nice at first but then in practice is a terrible idea. Too many people would find it fun to block paths and doorways to important NPCs/locations. And in my experience, any game that at all fosters hostility or frustrating mechanics like that gets the worst community. To be honest, I killed a spider in a doorway by mistake and then couldn't get through the doorway.

Open world would be cool but as stated above, I read it isn't possible with the engine.

Full loot PvP is another thing that sounds fun, but in practice, isn't. I've played enough MMOs with things like this to know that I hate it and if Gorgon went in this direction I would stop playing immediately. I don't play to be griefed.