there should be an option to 1-hit enemies if you sneak in from behind with long dagger and assassinate them.
It should be something with holding the attack while aiming at the head or something so it cant be done in a regular fight, but it would make long dagger better and much more fun without making it OP in any way, and it would open up for a whole new kind of RP'ing.
I cant stand sneaking up behind an enemy without a noice, silently moving in right behind him, stab him in the face... only to damage 1/5 of his life and then get killed when he turns around and slashes your face with a nodachi.
It wouldn't mess with the reality thing either, since you should be able to kill someone if you manage to get behind him without him noticing you and you have a long dagger.
EDIT: probably not possible without WSE, but then we might be able to do it
This ability should not be possible when using shield and tehre should also be certain restrictions on other stuff (so you dont walk around with 1h/shield and then just switch to dagger when yu get the chance to backstab someone)