Usecase: A plugin spawns stationary NoAI raider mobs as NPCs. However, during a nearby raid mobs participating in a raid will recruite nearby other raider mobs to join the raid (see PathfinderGoalRaid), and raider mobs themselves will also periodically check for a nearby raid to join (see EntityRaider#movementTick). Minecraft's EntityRaider mob has a property "CanJoinRaid" which allows toggling whether the mob can join raids.

Would it be possible to expose this 'CanJoinRaid' property of EntityRaider in Bukkit's Raider?

I.e: Raider#isCanJoinRaid and #setCanJoinRaid

Those would map to EntityRaider#eD() and EntityRaider#u(boolean)