A command from Quake 2:

hand 
Type: Toggle

Default: 0

Description: Toggle the handedness of the player.

Values:
0 - Gun on the right and shots from the right.
1 - Gun on the left and shots from the left.
2 - No gun and shots from the center.

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I assume in Q3 it would be something like cg_hand.  If this is something that's only able to be done in mod code rather than engine code, I do have a request that's still on the same line.

Currently our mod has a bunch of _1st models that are all right-handed.  If we wanted to make them left-handed, we would have to either translate them to move them left (which looks very odd) or remodel and re-rig them to be left-handed, which is a ton of work.  In Q2, the "hand" command basically (from my understanding) used some opengl commands to mirror the models around the center of your viewpoint so you kind of had a poor-man's left-handed model.

It is a cheap and easy way of getting left-handedness with minimal work on the mod creator.  However, I don't believe this is possible in the mod code where we'd normally muck around.  Maybe add some trap for that function or some way to expose that functionality to mod creators?

The background is that at one point someone wanted to port Dirty Quake 2 (based on Brazen) to the Quake 3 engine.  Traditionally, DQ2 used the Action Quake 2 assets but had a different codebase entirely.  So, the person wanted to use Reaction Quake 3 assets and port over the Brazen gameplay.  Problem was, there was no easy way to get akimbo everything or mixed akimbo everything without modeling it all from scratch.  You can see some screenshots showing the whole one-gun-per-hand thing they had going on:

http://xoperations.gaminggalaxy.net/dirty/images.html

Hard to see in some pics, but it was more than just the two pistols.  They had machine guns, knives, etc.

One of our requirements for our mod has traditionally been that it should work in a QVM so that it's cross-platform.  So if there were some way to expose this type of functionality so that a QVM-based mod would be able to do something with it, I think it would bring value to the engine overall.

I know there are people who will roll their eyes at the whole left/right handedness, but I have seen a project attempted and abandoned due to lack of this support so I think it's would have a larger impact than just making left handed people happy.  

If a mod team is blessed with an animator/modeler who can spend the time to generate both right and left handed models, they can safely ignore that extra functionality in the engine or remap "cg_hand" to load their models rather than let the engine mirror the model.  However, for one-man coding teams, I think it'd be very handy to have some type of ioq3-standard way to expose this functionality.

So, please consider adding this ability in one way or another!