This is a general wishlist of things that server owners need, particularly for successful public servers. Not every server will need all of these, but, these solve real problems for server admins.
- Logging, logging, logging - block logging, logging of anomolous events, filters to make sense of all this
- Ability to log just specific events (break diamond, chest interaction, etc)
- Statistical detection of possible cheats based on behavior
- Anti-XRay based on lying to clients about all the blocks they can't see
- A completely airtight vanish implementation (spectate without showing up on the user list, and without introducing side effects that other clients could detect)
- Rollback tools (partly covered by worldedit, but it would be nice to be able to do a rollback of a particular user's actions)
- See locations and logs of all players
- See inventory and enderchest of all players
- Explosion limiting
- Fluid limiting
- Claim protection
- Seed splitting (different seeds for structures, slimes, ore generation, etc, or even better, ability to use cryptographically secure randomization for these independent of the world seed)
- Freeze/unfreeze players (frozen players can't interact or take damage)
- Easily change individual players spawn points
- Server pause (I know we have carpet /tick freeze but carpet has compat issues, and this doesn't freeze players in place)
- Find all loaded chunks and why they are loaded
- Search loaded chunks for redstone, entities, etc
- Delete items on ground
- Kill mobs easily and selectively without dropping their items
- Out of game editors for region files and player data
- Change players location (for example, to move them out of a chunk you intend to delete)
- Delete chunks
- Chunk pruning to remove uninhabited chunks
- Region file repair tools
- Search and replace for items/blocks
- Some sort of vanilla friendly way to make it easier for players to find slime chunks without knowing the world seed?