Start the game with the following parameters (QW.EXE -console) then bring the console down by pressing '`' key and enter cheats below.

Sniper Zoom Mode - smoothzoom_on / off
Change Player Name - name new name
Show Frame Rate - u fps_on / off
God Mode - t_super_on / off
Complete Mission - t_win
Start Recording - u rec [filename] (record game)
Start Record File - u replay [filename]
Quit Game - exit