Suggestions

Spawner

The distance from a spawner for it to be activate should be slightly more than 14 blocks. I recommend 20 blocks instead.

Mob Limit

I feel as though the mob limit should be increased slightly. Especially the nether spawns. The mobs in the nether barely spawn enough and a slightly better mob limit would be more beneficial to the players.

Item enchants

A plugin that could allow us to take enchants off of items onto books.