I've had this set, but haven't done it in so long, now I can't remember where to set it in Z4. Some people have an issue with their ZBrush where they sometimes get jumped way far away from their model, and then have to zoom back in and get situated again. Happens pretty regularly. I remember there was some timing…
are you talking about you zone out of the frame and see you model very far than you actually zoom back in and adjust? If so, try the F key whenever that happens. Since you are pro, I cant seem to give you any other tips than that <.<. I'll wait for someone to post the pre-sets so I can set mine up too.... *didnt even know…
It sounds as if you're describing the Alt-double-click behaviour which frames your model. Dunno if it's the same in ZB4, but it was found somewhere around: Preferences - Interface - Click Time/Distance, setting both/either to zero.