I just discovered these codes, and i would like to share.
Here it go:
Turbo Mortars Strike (It will instantly detonate right after you deploy the coordinates)
set scr_timeBetweenMortars "1"
set scr_timeBetweenShells "1"
set scr_mortardebug "1"
set scr_mortarDistance "999"
set scr_mortarStartRatio "1'
Big Napalm (It covers the entire map, and the burn effect lasts forever, WARNING: There's no safe point)
set scr_napalmImpactDamageRadius "9999"
set scr_burnNapalmEffectRadiusSmall "9999"
set scr_burnNapalmEffectRadiusLarge "9999"
set scr_burnNapalmDuration "9999"
set scr_napalmhalflife "9999"
Instant Kill Nova Gas, and nova gas stun effect last forever
set scr_poisonDamage "999"
set scr_poisonDamageHardcore "999"
set scr_tabunInitialGasShockDuration "999"
set scr_tabunWalkInGasShockDuration "999999"
set scr_tabun_shock_height "99999"
set scr_tabun_shock_radius "99999"
set scr_tabun_effect_radius "99999"
set scr_tabunGasDuration "99999"
set scr_poisonDuration "8"
set poisonDuration "999"
Impossible to hit with guns (Except shotguns)
bulletrange "0"
Gunship turbo missiles
set scr_heli_missile_regen_time "0"
set scr_heli_missile_reload_time "0"
Super Cobra
set scr_heli_target_recognition "0"
set scr_heli_turretClipSize "999"
set scr_heli_turretReloadTime "0"
set scr_heli_turret_spinup_delay "0"
set scr_heli_visual_range "9999"
Killstreak Chaining
set scr_allow_killstreak_building "1"
Disable Killstreaks
set scr_game_killstreaks "0"