I have not played any MP yet (still learning to walk in SP), so when I first saw 'NAP' I thought "but did you wake them up? If so they might be mad."
Anyway bad pun aside; I have played SEIV (and other games of similiar nature) and note that usually several grades of diplomacy. For example: Non-Agression Pacts, Mutual Trade Agreements, Mutual Defense Agreements, "You're my Slave and give me everything of yours" Agreement, etc...
Both Johan and Verjigorm have valid points about not stifling the variety of treaties. Or setting an official standard. But I do see some value in a definition list of some type that would give general guidelines while disclaiming that at anytime any and all points could be dropped during a game => posted on one of the fansite webpages (so it would not be official). At least this way you would not have to draft a laundry list each time as Tuidjy seems to do, but could quote a community standard starting point (i.e. NAP + Artifact Agreement + No Surprises) or (i.e. NAP + Global + Surprises) or ( ad infinitum ). Any thoughts on this???