Shared map discovery on Multiplayer

When mapping with friends we often split up to clear the map faster, and have better visibility without having to discern between each other aoe effects and enemy aoe and any other clutter that comes from having multiple people in the same area. Problem is half the time one or both of us is just running through empty corridors and fields of corpses because you can't see where the other has been. Not really a top-tier complaint, but it happens enough to be pretty annoying.

It would be really nice if the map would reflect the other party members discovery as well for efficiency. Most of the time I'm just watching skill/buff timers run dry because I'm trying to find enemies that have already been killed even though the map is undiscovered in that area for one of us.