Butch, There "were" devices where you reached under the front of the FWD car, maybe from under the hood, and diddled with some kind of collar-looking thing that un-coupled the outer/wheel end of the CV shaft assembly from the inner/transaxle end. I just tried a little research and found this about REMCO:
"Axle-Lock disconnects for disengaging the automatic transmission of a front wheel drive vehicle, These units are no longer available, information for reference only!"
I'm not sure why they went away, but I can see a few possibilities.
1. FWD cars play very well with dolllies.
2. Disconnecting only one half-shaft (CV axle) leaves the differential part of the transaxle spinning and acting as if the car was doing around a corner.
3. There was no actuator cable for these, so you had to reach/crawl to get to the release collar.