It's by design that he lives and flies away to battle you at the end really. Anything else you do to "try" to kill him with NPCs is technically cheats anyway
The light amp goggles might not still function properly I'm not sure. The image is missing plus they may have taken some of the renderer code out that actually lights the scene more.
Well they wouldn't necessarily be overpowered but isn't the point of skill trees to allow people to make such types of builds that either are mostly one or a mixture depending on their play style.
Well I get random spikes of low fps for a second on Atlantica even in vanilla with my 980gtx but that might be my computer having issues and it's infrequent. Or it could be the PVS of the map I'm not sure.
I would imagine for the most part it wouldn't auto update without testing first. I would also be interested in seeing a multiple release strategy with channels like other popular software but that would take a lot of planning and effort to build.
The animations config isn't like a normal script config file so I think you'd have to code something to modify the animations in real time. And I'm not sure how it would work for MP as it needs those files on client and server