Guys,
Thanks for all the thoughtful responses to my post. Clearly this is a much deeper subject than I realized. Lou, we used to have one of these machines in our rough mill years ago when I worked in a furniture factory in Grand Rapids, Mich. In the midwest, it's called a surfacer, and is standard equipment in a large scale rough mill. It is a wonderful machine, and ours was not scary at all. The hundreds of metal spring-loaded fingers would take a board with any amount of distortion and flatten it on the bottom side in one pass. Then the board would continue down the conveyer to the planer for final thicknessing. Ours was 24" wide with a helical insert head, so it was very quiet and your hand never got any where near the blade. If I had the space, I'd hunt the auction sites for an old one. Even a relatively small shop could use one of these.
Marcus, I can certainly see how having a feeder on the outfeed of your large jointer would be essential for those massive mahogany boards. I usually end up rigging my wheel conveyers in position for support in this situation, but with mixed results. I just end up doing the contortionist's lean as I feed them through ( I weigh about 275, so I can do pretty big boards).
It seems that John's feeder is a small-shop version of one of these large surfacers, which are really all about the spring-loaded teeth that push the wood along without pressing it down flat as it passes over the cutterhead. I never knew such a thing existed, and I will look into it for my DJ20 soon.