In order of importance:

• Damage is now registered correctly! All (most) sources of player damage are now counted against you while fighting, not just melee. Bows, potions, TNT, and wolves are all confirmed to work.
• The config now loads correctly and has new features. It technically had one already, but it didn't load correctly. Everything you can change is now fully documented in the file and on the main page.
  
• The display has been moved to the game's subtitles instead of chat, so it will be a little less spammy and a lot more noticeable.
  
• Multiworld now works consistently and how you want it to.
• It's faster for servers with players who aren't AFK.

Basically everything works now, except for a few compatibility issues. The only confirmed one is that mcmmo unarmed damage is absolutely broken and will deal more or less normal damage.