I'd actually like more refinement to weapons. You know how in cod or whatever you can trick out your weapon with different rails, scopes, etc? If they could do something like that in a souls game it would be cool. Maybe slight tweaks to the moveset, etc.
I'd also be cool with an optional bigger grind endgame. Like, get your weapon to +10/+25 (depending) and then you can do other shit with it.
Also, I miss armor upgrades from DS1. They could do cool stuff with that.
That being said, Im perfectly fine with it the way it is, and doing what I am daydreaming about could seriously fuck up the whole game if done wrong lmao, Im not the from devs, just some rando fromdrone on the interwebs.