A friend of mine has cut all the "glad-hands" off his Kadees. (He has also superdetailed everything with coupler release levers, etc.... but that's another story). He uncouples everything by hand using a tool from Micro-mark. For sidings he cannot reach, he manually sets the couplers to "delayed uncoupling", and then backs the train in to drop the car.
His arguments are:
1. In his era (late 1950s, early 60s) uncoupling was done by hand (related question - is it automatic these days??)
2. @#$&* permanent magnetic uncouplers uncouple things at the least convenient time.
Our local club has agreed at least with point #2, and will shortly remove all magnetic uncouplers from the club layout.
Andrew