Like Mike mentioned, it's important to point out the level of difficulty in converting different brands of rolling stock.
If the beginner sticks with Atlas and Weaver, he can get his feet on the ground and be off to a good start. Starting out with one of the more difficult freight cars is sure to discourage.
I know that other manufacturers now provide Kadee mounting pads also on some newer models, but beginners should be encouraged to start simple, and all Weaver and Atlas are easy.
As far as uncoupling is concerned, in this day of walk-around command control, the screwdriver/coffee stirrer method works fine. Like Hot Water pointed out, by taking advantage of the delay feature you can spot cars in just about any "unreachable" location.
Pete, I think the time is definitely right for an OGR article on Kadee couplers.