Well actually...
BG2 is basically what could be termed an interactive story. It shares many traits in common with a normal ordinary book. It has a begining, it has a middle, it has an end. It has a central plot that forms the backbone for the story that you can't really deviate from.
It doesn't matter if you're playing a good, a neutral, or an evil character. Your motivations might be different, but you still do the same things. Get out of dungeon, pick up a party, raise money, rescue Imoen (regardless of motivation, you can't avoid rescuing her), travel through the Underdark, help the elves of Suldanessellar, and ultimately confront Irenicus. THE END (unless you have ToB, which just extends the storyline.)
What modders are doing is basically adding options to the main plot. Extra quests, NPCs, tweaks to game mechanics etc... You can't turn BG2 into an MMORPG style of game, because like all stories... it has an end.
The only way to do it, is to make a TC of BG2 which removes the main storyline.
You're better off playing around with the Aurora Toolset... Plenty of people have tried to make Persistant worlds using it. I couldn't tell you how many succeeded, because frankly I don't know. The ones I played during the early days of NWN modding, were, quite frankly, boring. There wasn't anything much to do (except kill monsters or even *gasp* craft!
(And if you're not really interested in modding, you could just try playing an MMORPG.)


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