It is actually the most annoying thing in the world when me and some friends are taking on a boss and one of us accidentally hits someone else's tamed or summoned mob, because suddenly you become prime target number 1 to that dumb little animal

Even turning PVP off on the server doesn't do anything, and V-Tweaks' function with this idea doesn't work with mods (it is bugged to make some enemies invincible)

FriendlyFire now has a team feature that should account for this. The vanilla team system could also probably handle this, just set their "allowFriendlyFire" option to false.

A setting to disable all incoming player damage would be nice!