Impulses 
Impulse
Action
10
Cycle to Next Weapon
12
Cycle to Previous Weapon
20
Throw a backpack full of ammo.
21
Throw current weapon
22
Select the Grappling Harpoon.
23
Display flag status; where your flag is and where the enemy flag is. Reset Flags if in bad state.
25
Display Server Settings
47
Select the Airfist.
69
Switch to previous weapon.
70
Turn status bar off
71
thru
81
Enable the status bar for various video modes, starting at 320x200 at 71, 320x240 at 72, etc. 81 is 1280x1024. If you set the wrong status bar type, things can go wacky. "71" is the default.
99
Display current location coordinates.
141
ID target. Gives you the name of whoever you are aiming at.
160
Fire Flare

170

Kamakazi attack:
Entering Impulse 170 will cause you to explode with great force.  The pieces of your body will fly around and then likewise explode.  Works one time per 10 lives.  Damaged is increased if you are carrying rockets.
180
Display what rune you are currently holding, as well as a brief discription about what it does.
181
Destroys the rune you are currently carrying, allowing you to pick up another one if you wish. Works one time per life.
192
Throw Stimpack.  Works 3 times per life.
200
Teleport yourself to a random location on the map. Will not work more than one time per life unless you recharge the teleporter by capturing the flag. Also will not function if you have the flag. There is a chance that the teleportation will fail, which will kill you.