You could also set up a cleanup.cfg for the keys that are changed between classes:
Open a new notepad document
Paste the keys you currently use for different classes and preface them with unbind
Then name this new notepad doc. cleanup.cfg
Code:
echo Clean Up Config Loaded
unbind mwheelup
unbind mwheeldown
unbind alt
unbind mouse2
unbind mouse3
unbind mouse4
unbind f
unbind g
unbind shift
unbind ctrl
Then put this line in each class.cfg