Regarding no-restart zone at Baium:
Currently there is no-restart zone only at AQ and Valakas. At AQ it is due to the fact that it was possible to relog buffed characters right where she spawns allowing the first clan which logs characters to kill her in seconds from time of spawn - this is not the case at other WBs.
At Valakas the no restart zone is (near heart) by default - here we only added a PvP zone..
There is no no-restart zone in front of the entrance to Tezza/Antharas & Baium and this can be a tactical factor as it was shown during the last Baium.


Regarding damage “sharing”
From our perspective this is not a bug. Maximum it is a poorly designed game mechanic, but you could say this about other mechanics in L2 as well. With world bosses that are not instanced you cannot speak about NPC instances, because even though the WB goes “to sleep”, it is still the same NPC. Every NPC remembers the damage it took until you kill it or server restarts. Drop is determined by levels of characters that did majority damage and this is not capped by max HP of the NPC. This is one of very basic game mechanics. Making changes here could influence the entire drop system - not only world bosses, which is too risky to change on a running server without extensive testing and could cause more harm than good