I think the design was in part , to spread the load more evenly on the frame. It is very apparent the way the kite handles in very gusty winds, and in reverse flight the wing flipping tendency is reduced dramatically, when using the sticks. I think the surgical tubing is a good idea. I got the tape idea from another post I read, where a very experienced Rev flyer suggested it. So far, I see no problems yet with the very tiny piece of tape on the verticals, but if I do, I will switch to 0 rings from Home Depot. The text in blue is copied from the link below.
" Redesigned for 2010, and flown by former AKA National Champion Quad-line flyer, Scott Weider,
I have spent the better part of 15 years flying with the “Magic Quad Sticks” attached to the back of my Revolution kites, understanding the philosophy behind the design should help you make the most of your flying time, improving your skills with a better understanding of the characteristics of the “Magic Quad Sticks” on a Revolution kite. The “Sticks” were designed to increase the inter-dependency of the wings on a Rev, thus enhancing the ability to fly in reverse, increasing the glide ratio for 3d type tricks, such as catch and throws, and with the interdependent wings the weight distribution across the body of the wing changes the center of balance when the kite is flat, as in axel rotations, the “Sticks” also provide advantages during Flic Flac type moves, in the air or near the ground to execute rolled up landings and then unroll it to easily relaunch the kite, without the extension of the sticks and lines off the back of the kite, these rolled up landings are nearly impossible to do. With the “Sticks” installed your essentially making a flat kite a form of three dimensional box type kite, enabling the fly lines to wrap around the kite to leverage your recoveries to a normal flying configuration. "
http://magicquadsticks.com/Welcome.html