How to use the feeds and speeds from the toolpath window

Hello again, I’ve noticed that the post processors in version 8 use the variables from the tool library and not from the toolpath window, I use Gwizard to get my RPM, DOC and WOC and input these into the toolpath window but in the gcode (from all of the post-processors AFAICT) the values used are from the tool library. Does anyone know the variable names used in the toolpath window so I can change the post-processor, or make my own file?
Cheers
Mike