Kirt,
I have a copy of the original class rules & "owners manual" for the Mosquito catamaran from 1977, in which a drawing for a system of tensioning battens on the water appears.
I`ts actually more of a self-adjusting batten tension device - a 3mm st/steel wire running from the top of the mast down the leech of the sail, through plastic end-caps on the battens with holes which the wire passes through.
The other end of the wire is attached to the boom - as you sheet in you increase the tension on the wire which forces the battens into the pockets, as you ease the mainsheet tension the batten tension decreases. I think i`ts a good idea in theory which in practice would never really give the desired result, which is why I`ve never seen it done.
I`m sure it would also contribute to hooking the leech, unless the length of wire were adjustable to compensate for different wind conditions.
If you`re interested, I could dig up the manual & post a pic of the drawing, just for a laugh.