If we follow the "...its been done before..." we all need to pack up and go home.
I think the spin to windward is an area worth visiting again. As boats get lighter and faster, and Spreachers get flatter, the ability for the Main to greatly enhance the Spin gets possible, and the geometry of moving the tack to good effect becomes viable.
Attaboy from me, for what it is worth.
By the way, while blade jibs acting as aircraft type "slats" have been around, has anyone seen a "slat" or blade jib in front of a spin? Seems like that is where it belongs to keep the lee side air stuck to a spin. (Yes, Wouter, that is theoreticaly not how a slat works (high velocity air sticking), but it does work...)