I am a noob, and I am glad this question was asked.
I was under the impression that NAP-3 meant: Non Aggression Pact- 
lasting for 3 turns.  After that 3 turn period, NAP is over- attack at will.
To me it seems silly to give a 3 turn notice before smashing an opponent.  I thought this game was about war!
Apparently, I would find more suitable diplomatic relationships in a 'free-for-all' or 'machiavellian' style game.  Not that I am one to back off of my agreements, but more because that is how I expect other players to be, and enjoy finding out if they really are, or are not.
P.S.  I am thoroughly impressed by the fact that somebody made a MOD based off of the old-school Avalon Hill 'Diplomacy' game.  That's just so cool!  
