There's two or three things I want to see supported in here:

1. Support for multiple playlists. Have a way of setting up multiple playlist files you can name anything (just plain txt files with sv_mapcycle_add in it). Then you can type in-game /play "playlist1" and it will load the playlist's instructions and sv_mapcycle_begin it. Optionally, another command could be /loadpl which could load a playlist during a game, but not start it until /beginpl initiated (sv_mapcycle_begin).

2. !vote. There probably isn't a feature I miss more than !vote (why wasn't this app ever released!??). Any player could initiate a !vote which would poll the players in the server for a vote and then, if a majority rules for it, initiates the command voted on. !vote kick, !vote ban, !vote map, !vote mapnext, and any others that would be suitable for voting on.

3. This one is a little more complex, but it is something I've had my eyes on for about a year and a half. It would be absolutely amazing for Halo CE to have a global banlist, especially with the condition the game is in now with all the aimbotters and other assholes. The app could check a database hosted on Modacity a couple of times a day and update a table in your app's database for disallowed users. Each time a new connection is attempted, it would check against the table for disallowed users and either allow or deny them. Note that this would NOT interfere with the banlist file, because that would probably cause more problems than it's worth with both merging and managing (like having to restart the server to update it). Talk to me about this.