1) A better forum.
2) Dungeon Master mode.
3) Expansions minimum 80 hours each (The first could be Descent into Avernus, the second in a great city never explored in BG, IWD and NWN)
4) Improving inventory, with tags, etc etc.
5) New Races (Aasimar for example) and Prestige Class.
6) 20th level, and why not Myth level like NWN2 MOB.