The way I took the idea was to reduce the overall travel of the servo, and increase the movement of the surface again by increasing the leverage points.
This will place severe stress on servo horns and clevis's. To increase throw with minimal servo movement, you will have to place pushrod to the outermost longest point on servo, and the tightest, closest point on control horn. This will place all stress in areas that weren't necessarily designed for it, instead of distributing it evenly. This is just my thought here, and I'm totally open for other concepts. Anyone else?