For whatever daft reason, quick-load is bound to F7 by default, right next door to F6 - the quick-save key. Accidentally hitting the wrong key can be very frustrating.
To rebind quick-load to F9 (the standard key in most FPSes):-
1. In the game's directory, back up the autoexec.cfg.
2. Within autoexec.cfg, search for the following line:-
rangebind "##keyboard" "##65" 0.000000 0.000000 "QuickLoad"
3. Change "##65" to "F9".
The line should now look like this:-
rangebind "##keyboard" "F9" 0.000000 0.000000 "QuickLoad"
4. Save the changed autoexec.cfg.
Enjoy.

Binding the quicksave and load keys next to eachother is god damn stupid. I have some hateful memories about that...

Thanks! Easily changed both quick save and load to F5 and F8.