I don't know about exporting control for a Portercable type router but I suspect it could be done. With a high frequency spindle ( i.e, Columbo ) it is a simple process of getting the command to the spindle as part of your g-code. The same command with a negative number reverses spindle direction also.
It is indespensible if you want to match your speed to you cuts without running separate posts for the same tool.
Best of luck,
Phill Pittman
www.masterwerkes.com digicarve@verizon.net