The Karakal strings look interesting. Have anyone tested these strings? http://www.karakal.com/index.php/8/category/23/accessories/
O.O they have crash tapes too, like victor. Hmm, these strings seems to be quite thin, around 0.65mm to 0.7mm. The durability might be lacking though.
The 'crash tape' is common in squash where the chance of hitting against the walls is great. For badminton (or even tennis), I doubt it is useful anyway.