You design a class which has lay on hands, aura of protection, the material trappings of chivarly (armour, sword, horse, etc). You then invite players to play that class if they want to. It seems obvious to me, at least, that the bulk of those who choose that class are going to want to play a valiant, chivalric character - after all, that's what it's good for. I mean, what if someone wants to play a cowardly fighter? Or a rogue who shuns stealth? Or an illiterate wizard? I just don't think this is going to come up all that often.