Well, the Swift is probably too light and flexible to make a good trick kite (yo yos, etc)...
1 - When the kite fully wraps up, the line around it creates compression (requiring some stiffness in the frame to sustain), and the lines can abrade the trailing (or leading) edge material if it's not "rated" or reinforced for this type of use... No guarantee the Swift can't handle it, but I know it wouldn't have been specifically designed for it.
2 - There is also the issue of weight... In order to flip the kite (yo yo), a little weight / inertia is needed, and the Swift is pretty light, so if you do try adding stoppers, you might also need to add some weight (5-15 grams) to the tail to facilitate rotation.
That being said... The SKY IS THE LIMIT, yo yo stoppers are cheap and a pretty easy, harmless install... No reason you can't try it, long as you have your wits about you and listen to the kite as you experiment... I've tried all sorts of weird with kites, much of it absolutely ridiculous - all of it fun and educational.
Did you know... Almost every slack line trick (like the yo yo) started as a mistake that someone managed to repeat and perfect?
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As for getting out of a roll up... Remember the compression I described above, and it's potential to "crush" the kite...
If you've got the kite rolled up and you're flying, the simplest and safest way out is to head straight up with your hands pulled down closer to your hips... Once you feel the pull reduce slightly, push your hands toward the kite, then let them drop back to your sides.
What should happen, is the kite's nose will lean back slightly for a second, then come toward you, initiating the actual unroll.
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You can also fly high up, turn the kite so you're flying down, then do the same thing... Soft push out (kite goes into pancake), then hands back to unroll... Trick with this is to remember, you'll be headed straight down and be loaded up coming out this way - so make sure you do this whole thing fairly high up, and be ready to turn away before you hit the ground.
And another... You can also do a ground pass, turn up slightly (rise 4-5 feet, nose at roughly 45 degrees up), then use the same hand motions to unroll onto a single wing tip or 2-point landing.
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Some good references...
Awesome tutorial
https://vimeo.com/25435954
A different sort of roll up, very weird...
https://vimeo.com/25164167
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I do love my rollups...
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Pretty soon, if you're not careful, you'll be flailing like this.
https://www.facebook.com/photo.php?v=1233727007467&set=vb.1357938423