Ken mentioned that Hunt Stookey's HT has mid boom sheeting. Its actually cooler than just mid boom, the gross tune is exactly like a standard main sheeting, but instead of dead ending it in the back, he ran it along the boom to a mid boom so the crew could do the fine adjustment. He put a big know and stopper ball on the and of the crew's fine adjustment so that if the crew was busy with the spin, the driver would be able to adjust the main sheet without having to worry about mid boom end.
I think this is the slickest setup I've seen for a two man boat. I'll see if I can find a picture.
Bill