Once a server is running (or perhaps in single game, on localhost), it would be nice to be able to send some Lua commands via simple socket connection and get the execution result. The commands would execute in the currently running server Lua context. This would greatly help debugging. Naturally, this socket would listen for incoming connections on the LAN interface only! Such implementation could be done using a Telnet interface (using PuTTy for client in Windows); the telnet interface would litterally work as a direct console to the server's Lua container; to be able to manipulate data while the server is running.
This interface would, of course, only be enabled through the server.properties file, using a configuration keys such as lua_console_enabled=true, lua_console_port=23, etc.