I feel that factions should be able to create parties that have the choice of trying to be stealthy. The reason being that monsters and wandering parties can get pretty big and it is tough to keep exploring because you are fighting all the time.
If I wanted, I should be able to try to sneak past the monsters without being seen. This could be a function of terrain cover and dexterity, intelligence and wisdom of the party. This stealth could also be used to spy/cross another faction's territory with penalties for being caught.
thanks