I do not know how Paladin is handled with official D&D rules. However, my understanding from presented Paladin Oaths in game is this:
Stand between the victim/protectant and their tormentor. One oath has the focus of first bringing the victim/protectant to safety. The other oath immediately strikes at the bad guy. In both cases, the paladin is basically following his function in the game.
Plus of course general things like not stealing anything that is obviously in someone else's possession. Not entering houses when there is no reason to do so.
I would not put every dialogue option on the scale of the paladin, because do the oaths in the game always oblige to be honest?
In any case, there should be a more clear instructions in the inventory for each paladin about what the current oath requires and obliges and what endangers this oath. Then maybe include some kind of strike system, like the masquerade breaks in VtM Bloodlines.
