Mergs - that sounds great and definintely put me on the "help" list if it's not there already. Funny - the Stowe Park is actually pretty tame in the double department (they fill in a lot in between sets) compared to typcially "trails". Land managers would freak if they saw some of the stuff kids jump.
I'm not sure if you heard about Cunnigham Park in Queens/NYC but they've been adding some very nice features:
http://www.singletracks.com/trails/photos.php?id=2099&photo=6997
Attached are some pics that I found recently - a tabletop line and a cool log ride . Would tables like these be fine enough for the land managers?
I've also been thinking of a way to make DJ's safer but still fun for applications like parks and towns - along the lines of a snowboard/ski table. A lip in the middle but a wide nice landing. The lip would be the hard part to figure out. I might try to draw something in 2-D CAD to see if my design would work at least visually.