This might be a bit late but I had a suggestion I posted a while ago. https://jartexnetwork.com/forum/threads/factions-chunkloaders.18825/
I feel this could be a nice feature to add especially with spawner durability. With spawner durability now, it will stop people always mining their spawners. The problem I always has is that at night times im not online so there is no one to afk spawners. But with the 'chunkloaders' it will encourage players to place even more spawners knowing they will make more money incase they get raided eventually.