MMO that lets players run servers and change the rules

Are we talking about the same Neverwinter Nights? I thought the view settings for that were pretty flexible and generally decent. Neverwinter Nights 2 had awful view settings, though – and more relevant to my point, it was very difficult to generate custom maps for NWN2, their file sizes were enormous, and any minor change meant players had to download the entire thing again, which made it almost useless for multiplayer use. There was also Neverwinter Nights Online, which I’ve never heard of anyone actually playing. (For the sake of completeness, there was an original Neverwinter Nights on AOL, in 1991, which I played for about two hours until my parents found out there was a charge per hour of game play.)