Have NPCs use "Bound" enchantments
I do not know how far this goes -- whether it affects armor just as much as weapons; and I've only really seen on Furius Acilius so far. But at least for him I can confirm:
He attacks me with a Demon Tanto and does not cast the spell on it do conjure a weapon that would deal considerably more damage. R.D. pointed out in #3704 (closed) that this behaviour affected vanilla MW as well, but it's still worth recording.
I'm attaching three screenshots: Him attacking (you can see what he wields), me holding the weapon (you can see how it's the same) and me with the conjured weapon (which naturally looks quite different; like a Daedric weapon).
(RM-3753 from redmine: created on 2017-02-16 by E. P., , closed on 2017-08-01 by nobody)