I am against a scripted-enforcement of this, for two reasons
1/ My feeling so far is that guild-membership is not a so deep RP-focused choice. Meaning that belonging to a so called "evil guild" will not force you to play evil, and belonging to a "good" guild will not force you to play good, and that more or less what values that are highlighted are just common sense for behavioring with other players, not real mind-shattering RP laws. I am not saying that is useless, but I am saying that could involve much more interesting content, and again that could involve much more RP... and PVP. I have in mind the server had a critical PVP era that brought some mayhem (so i was said, i am too new for that), but still... this server is a PVM heaven with no PVP. Ok that is it and I am fine with it, otherwise I would not play so much here.
Bottom line is that it is useless to "declare" guild membership. So far.
2/ Considering the current guild involvement, while hoping for more PVP RP, I plan to have each of my main chars in one guild, so I can differentiate each behavior when switching, provided it is enforced at that time.
In short, I don't want to be limited to one guild per player, If I can avoid it.
Ps : No, that is not for trinket shopping...not only.
Finally, I have no intention to let O cult be the only good boyz (which they are, for sure). Helping new players is a real pleasure that does not necesarrily involve wearing a cloak, however nice it is.