In reply to rascalxx: You used to be able to buy little rubber things that sorted this problem out. Alternatively you could just tape them. However, it isn't really the end of the world if your krab ends up the wrong way round. You just put it right and clip it as normal. Adds about 2 seconds to the climbing experience!
When I come to replace my slings, I will be buying longer ones which will double as either long or short quickdraws and the krabs will likely dance all over the place.