Sorry forgot to mention, yeah, you can run a stage in both directions. From the onboard footage on Youtube I think they ran 1 of the 3 distinct stages at last weekend's event in both directions. I've also worked out from it complete route maps for 2 of those 3, to give you guys an idea of what you're aiming for:
SS3/4
http://img18.imageshack.us/img18/3365/ss34z.jpg
SS7/8
http://img18.imageshack.us/img18/6599/ss78.jpg
N.B. The numbers beside each split show which one to take, ie. "1" = take on 1st approach, etc.
And yeah, if you're refering to the one I'm thinking of, the "yump" just south of the mini-roundabout on the outside of the Esses can be used (see 7:07 of
this vid). Or is there another one you're thinking of?