At the present time, ZBrush doesn’t support multiple cameras being active at once. There are different ways to store camera positions for quick recall. These include:
The Universal Camera feature
The ZApp Link menu. This function is also duplicated someplace else in the program if I recall correctly, but can’t remember where off the top of my head. Bonus points to anyone who wants to come dunk on old Spyndel here
They do! But it is not a reliable way to communicate with them. These are the community boards, and it’s mostly a place for users to help other others with usage questions.
If you’d like to submit a feature request directly to the developers of ZBrush, the Pixologic Support site is the place to do that. They have much better tools there for tracking this kind of information and seeing that it gets into the hands of the people who actually develop the program.