yeah, the auto stop doesnt work. (i just used one of these bottles when pitting for a friend at the hpi challenge in the northeast) BUT the bottles soft material makes it easy to squeeze and fill the tank up fast. so i ordered one for myself, gonna bring it to the worlds.
without spending big bucks on a real fuel gun i dont think you'll find anything to avoid the mess. dont worry about it, a little denatured alcohol after racing is a lot cheaper.