I don't know if you have noticed that when you minimize CS/CZ and then return to the game you sometimes have switched weapon hand. Here is the solution to fix it (or go the long way through the options menu):
alias righthand "left"
alias left "alias righthand right; cl_righthand 0"
alias right "alias righthand left; cl_righthand 1"
bind key "righthand"
copy paste that into your userconfig...
or use the easy version:
bind "key1" "cl_righthand 0"
bind "key2" "cl_righthand 1"