I thought I made a post on this yesterday, but apparently it didn't go through.

A scant few spiders are born as 'train wrecks'--the wobble is so bad they have difficulties that prevent them from living normally. They can usually be assisted--you have to put the food in their mouth, for example, because they are too uncoordinated to find it on their own.
"Train wreck' spiders are fairly rare. Most spiders are perfectly capable of eating, breeding, and living normal lives, and they appear to be perfectly happy to do so. They show no signs of stress from their condition.

So, why not breed for increased wobble? Because increased wobble results in a snake that cannot care for itself--a 'train wreck'. Obviously you do not deliberately select for an animal like that. You don't breed your Persians with faces so short they can't breathe, and you don't breed your miniature horses with legs so short they can't bend at the knee. Extremes can be BAD for the animal.

People ARE attempting, in a fairly relaxed fashion, to select for reduced wobble in spiders. There is no way of knowing whether or not this will be successful in the long run. It's possible that selective breeding could eliminate or reduce the incidence of severe wobble over time, we'll just have to wait and see.

I know you're were just trying to instigate, but I figured I would give you a rational reason why you shouldn't be breeding for more wobble in spiders (if it were even possible to do so, which is definitely not certain).

As for the spider mutation itself...it has a quirk. No one is certain whether the quirk is the result of a neurological problem, or an inner ear problem.

Examples of animals that are commonly bred for odd traits like this include waltzing mice, and fainting goats.