Also, will this mod keep spells/arrows hurting your fellow players or allow it to pass harmlessly through them when you haven't purposely gone aggressive on other players?
Can't imagine playing alongside a sorc or a rogue with this mod when they spam spam spam arrows/spells like they do in higher level areas.
This mod is still in alpha version (no quests; bugs; needs balances) but it's playable since 0.091 (that's when I started) for multiplayer fun.
When someone joins your game or you join others you are automatically in party and can set hostile against player(s) or back to friendly mode (actually I don't remember trying this). Unlike Vanilla Diablo 1 your summons can't be damaged by you.