You can change to an OGC setting by pressing one key and keeping old of it, and as you let go, it turns off.

Script Made by Sin
tfcscripts.cjb.net

Please do not say this script is yours

I only added quick access to the ones i thought were mostly needed.
these were 
-Auto Aim
-Auto Shoot
-Aim Thru Walls
-Wall Hack
-Spikes
-Zoom

Advantages - Quicker access to the OGC commands

to start it working you could add a line to the autoexec.cfg as "exec csquick.cfg" (without quotes) or type it in the console in game.