This is mostly QoL, but super irritating, because we don't play against each other.
My gf and I are running a multiplayer session now, and there are a few things which are super irritating:
1. No shared stash, everything needs to be transfered
3. Lack of an "autofollow" function
4. Distance limit when transfering stuff is highly annoying, because it precludes multitasking in some situations
Best option: offer "coop enhancements" between players with opt in and opt out between pairings.