Make SRB2's built-in text prompts more flexable
The only way you can currently call text prompts is by using Linedef type 459, and it only works in single player. Personally, I think text prompts should also be available in multiplayer, as well as be callable via a Lua function.
Some reworking may need to be done to make it so that text boxes can be set to only show up for the player who activated it, but it's a little silly that you can't do this stuff already.