Described on this page are some tactics that keyboarders can use to play more effectively against opponents with 3D controllers.
#1 The permanent down-aim.
One of the most effective tactics open to players with 3D controllers is the technique of aiming a rocket launcher at your opponent's feet. This has the two-fold effect of making them alot easier to hit with splash damage, since the rocket detonates against the floor, and also knocking the target around, disorienting them and leaving them open for a second shot often before they hit the ground again. This tactic is also available to keyboarders, in a limited fashion. Try this: Drop the console and type +MLOOK. Grab the mouse and aim the crosshair at a point about 12 "game feet" in front of your character. Now let go of the mouse and run around the level happilly keyboarding. Just maneuver until your opponent is standing on the crosshair, and pull the trigger. The disadvantages to this technique are that it limits your effective range to the distance you decided to aim at. However, the range can be adjusted dynamically to a degree by jumping. By firing at the height of your jump you extend your range by at least half again what it was. You can fire in the middle of the jump to hit at different ranges. Also, if you pick up another weapon, you'll have to hit your center-view key, or else it won't be very effective. You should also note that going through a teleporter will reset your view to center.
#2. Countering the Deadly Circle-Strafe
Another deadly tactic used by mousers is the circle-strafe, in which they strafe around you in a circle, firing at you. Many players make the mistake of standing still and trying to rotate around and shoot them. This is not the way to go. There are only two real options available to you when someone is trying to circle-strafe you:
Charge - Don't just stand there! Run right at them, try to intercept their path on the circle and blow their head off up close. If their mouse speed isn't up very high, they won't be able to turn in time and they won't even see you!
Seek a more level playing field - Mousers have the advantage out in the open. Run away and seek a more confined area. This will allow you to bounce your rockets off walls, causing splash damage just like they can, and more constricted areas are impossible to circle strafe around someone in.
#3. Know Where to Hunt
Certain terrains favor certain control devices. Wide open areas favor 3D controllers because they can get splash damage by aiming at opponents' feet. Also, wide open, multi-level areas such as this one favor players with 3D controllers because they can quickly aim and fire at targets above and below them. A keyboarder would be at a HEAVY disadvantage here, unless they have 3 hands and God-like coordination. What's a keyboarder to do then? Choose your battles wisely. Just don't fight in places like this, and hang around areas like the one below. No places for ambushes from above and below, and walls everywhere to bounce rockets off. In areas like this, keyboarders are even with 3D controllers, and maybe even at a bit of an advantage, because it's easier to aim quickly in 2D than in 3D. This is where you should run to if someone is trying to circle-strafe you or is incessantly pounding your feet with rockets.
#4 Pick Your Weapons Wisely
Along the same lines as the last tactic, different weapons are also more or less effective depending on your controller. Rockets are obviously a mouser's best friend. Grenade launchers are also more effective in the hands of a player with a 3D controller. However, the shotguns, nailguns, and the shaft know no bias. In fact, because a keyboarder doesn't have to worry about vertical aiming (in a flat area, anyway) you may be able to use these weapons a bit more effectively.
#5 Countering the Jump/Fire Combo
Another tactic mousers usually use on the hapless keyboarder is the technique of jumping around constantly while using the height to fire rockets more effectively at your feet. This gives them some advantages, primarilly that it lessens damage if you do manage to fire at their feet, and makes them move eratically enough that direct hits are horribly hard. You can use this against them though. Use the Permanent Down-Aim to try to hit their feet while they are jumping. They'll get launched a long ways away in a direction they weren't planning on. If you're quick you can fire at their predicted landing spot for a quick follow up shot and hopefully another bounce. If you're quick, you can keep bouncing them around until they die! Be wary though, a quck-thinking mouser can use these impromptu rocket jumps to his advantage by firing down on you from on high.
If you have any suggestions for the tactics page, mail them to Darkwulf[CA]!