That wont work for MP.
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Ooh! Rippable turrets like in H3!
A "bullet_time" command, which modifies speed for everything BUT the player (ex. "bullet_time 0.25" would make everything move super slowly around the player, "bullet_time 0" would freeze everything BUT the player, "bullet_time 2" would make everything go twice as fast.
Also, a "player_speed" command. Unlike bullet_time, this would increase/decrease the speed of the player, without slowing anything else down.
These two could be used together for a "Mythic" run through a SP campaign, with "bullet_time 2" to speed everything up and "player_speed .5" to slow down the player, making everything MUCH harder.
Slow Mo? Which syncs? So EVERYTHING/Everything apart from the player moves at a set speed, so you could run around a rocket or bullets ect... Like English Mobster said.
This may seem fairly pointless, but can we get a (printf formatString [object [object [object ...]]]) function for scripting? Particularly for easy debugging in-game.
Post moved to later page, I've added an extra idea too.
There is a way to do lunging, and it's been done, but over MP its incredibly laggy.
Change Spawning system.
Being able to change it to that of another gametype's.
like CTF, Team slayer or maybe Co-op (where allies respawn near each other)
+1 for increased playercount
Preformance optimizations
Support for decals on 8000 series GFX cards
Wider range of visual settings
visual settings saved in a cfg file in a similar way as oblivion, or crysis
Animated reticules
Better netcode (bullet syncing)
AI stationary turrets (like the ones on snowbound)
Multiple map formats (able to use simple map formats, like quake 1 or quake 2 since they all use bsp map styles)
HL2 map support :3
Shader Module 3.0 support/emulation
Sandbox game mode (like gmod, but in halo)
Support for lua scripts and gametypes (like gmod, again, lol)
Support with gmod addons (if the above are allowed, or with a special converter)
Full RTR shadows, Dynamic lighting (both soft, and hard lights, chosen by user preference, or the map itself)
External Rcon app for controlling and monitoring the server and chat without having to enter the game.
use IRC chat system ingame, allowing the above to be possible, or atleast easier.
Customizable armor
Custom player models (like ut3 and ut2k4)