I don't really see the problem. Just like you can sell and buy items at a shop there shouldn't be any trouble to have some kind of generator for chanse - like a dice roll.
Did anyone play the old game Moonstone and remember the in-game dice table? Like that one. Simple and fun.
Think this's been mentioned earlier, but it would indeed seem like a good idea. A pazaak-like game would integrate the in-game with the overall adventuring, which tends to work well.. though it shouldn't do so to a point where it feels mandatory to engage in a lot of tavern gaming.
Maybe if you cast the Luck spell before playing you would increase your chances of victory and you could similarly wreck someone else's chances by casting Miscast Magic on them.
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Did anyone play the old game Moonstone and remember the in-game dice table? Like that one. Simple and fun.
http://forum.baldursgate.com/discussion/comment/116171/#Comment_116171
@Tanthalas may wish to merge them