Disable PVP for those who join boss fights, and related thoughts

In the past (unsure if since fixed, but my report isn't marked as fixed yet), if you joined a boss fight with /boss join, PVP is enabled before the fight starts, and after the fight ends. I think it would be good if players could have the option of joining boss fights without having to worry about PVP in the window before/after the fight I think it being enabled before/after the fight is unintended, but making this suggestion to make it clear why I consider this important. Having PVP enabled while there is no active fight (i.e. going into the arena to place a boss egg) I see as a separate question. I'm not sure what my opinion on this is yet, but I do have some thoughts SEE BELOW