Things that are probably impossible to do in SpongeAPI currently, that I see minigames servers and packet interceptors cabable of online.
Most of these I wish I had time to develop plugins for, including API, to create a kick ass server.
- Just 'Hide' an entity to a specific set of players.
- Exclude a set of players from targeting by AI's, commands, or other players.
- Change the appearance of entities/players to other players.
- Send "fake" entities that are manually tracked and simulated emulated by a plugin, total control, no performance problems of many copies of entities being tracked in the global entity list, no risk of accidental persistence in saving.