Hello.
#1 I know about that and was thinking so much about that problem. Unfortunatly for now I don't have solution to it, maybe with new client... In case I will find solution to it, it will be changed. But yes, this is my main problem also, but this is not the end of the "automatic events" mechanics, it's just start when we establish basics ( spawn mechanic, random event starting mechanic, build everything in 1 NPC mechanic ).
#2 - this part is not criticism of the ideas, just my process of thinking during event development.
2.1 Don't have existing system ( have spawn on death with % chance aka "Goblin event", but have issue with it because it conflicts with already existing normal mobs using this spawn method ). How it will work in a group where only 1-3 chars killing mobs, supports can't trigger it in this case. If 9 people in party can trigger 9 NPCs and participate in event 9 times, so you get 81 rewards and if you will force everyone in your clan farm near you it will be up to 50*50=2500 rewards, or you can participate 1 time in X amount of time, but then trigger NPC by other players in a group will go to waste after 1st one.
2.2 Lineage2 can't react to your chars level. It can either give you scroll based on mob you killled level or restrict you from using scroll if you are not in level range. Problem with spawning this boss: most of the players will hide in castle or any other area no one know where they are to kill it, which I'm trying to avoid during the automatic events creation ( I have idea with boss kill event, but it will be more predictable ). Even if you predetement were boss can be summoned, people will abuse timezones to spawn them when war side is not online.
2.3 There are many ideas of the events, but we need to include "players behavior" into consideration. Many players will not help their wars to win in event if they will be randomly selected to their wars side, they actually will do everything in their power to prevent wars from winning even if they will not get reward too ( and then will shout "haha I made you lose" or something ). So there will be many restictions. Also not everyone will participate event when they will be selected leading to sides inbalance, other people outside of the event will interfere with it.
2.4 It should be specific time during the week for several hours, players must get something insanely good out of it, or they will not participate ( current normal events is free extra reward that just added to what you already doing, this will take players away from farm ), time zones issue.