Gotta disagree with you there, icey...you're quite articulate and i appreciate your starting this interesting thread.
Agree very much that it can't be "controlled" or stopped. It can happen very fast, and it can last for a day or two.
i'd be really interested in hearing if slowing or stopping play works for you, if you and your Dom experiment with it. i tend to want to push limits once i'm in subspace; i doubt i'd be able to slow myself down.
It does help me to know that it's a normal and expected consequence of the kind of play i like.