[llamabeast]

Arguably unfortunately, NAPs are often taken as binding, and many people will get really quite upset if you break them. My recommendation is either not to break them, or to make it explicit at the start of the game that you will be roleplaying, and therefore it is possible that your character may not hold to treaties. I think people cannot get annoyed at you if you let them know in advance that you may not be dependable.

I think it would be good if more games were started as "Machiavellian", where the understanding is that all diplomacy may be reneged upon, as in real life. Having said that though, I've still never actually organised such a game myself. (Though these days I don't organise that many games myself and much prefer it if I just act as host and someone else organises and admins the games - I'm always willing to host if someone asks.)