Suggestions

Remove Enderpearls in combat

This literally makes any dork just be able to run away from a fight when they're low and makes pvp literally unplayable. Remove it so that people need actual skills to run away instead of just chucking an enderpearl

The MCmmo nerf is Painful

Please buff MCmmo again. It's kind of unfair that players who joined prior to the the need have a very high level of PvP MCmmo and they can easily defeat others in PvP. After 1 hour of grinding my sword MCmmo increased by 2 levels

Make SpawnerExtractors preserve full vanilla mob drops

Suggestion: Make SpawnerExtractors support more mobs consistently. Right now some mobs, including Vindicators, seem to not have selectable options in the extractor system and instead spawn normally as entities instead of being auto-killed and stored like most other mobs. This makes certain spawners much less useful and limits possible farm designs.

Leaderboards

I suggest making a command like /kill top to display the top player who have the most kills, /death top to display the top deaths, and /player top to display the best players according to there ELO rating.