Hi,
The mouse gesture system is not for camera moving, but rather to run user defined functions, with the node the gesture is activated upon as the focus. For example, when you specify a node to have the "right press, left, right, left" gesture, and link it with a user function that sets the node as the focus node (and change some attributes), that user function will be called when a user does that gesture.
What looks like a pie menu is actually guides for the mouse gesture system. Maybe in future versions I'll be making a real pie menu.. but the fighting-game-esque gesture-combo system was enough for what you may require of your mouse and skyrails.
As for the next beta, I don't know if I can release it at its current state. If I release it the way it is, there will be tons of emails notifying me about bugs, how things are very non-intuitive (especially in regards to the experimental gesture system) etc.. and to be really honest I'm sort of in a holiday right now (and at least for the next few months).
So yeah, next beta, I can't guarantee anything, very sorry. But, when it actually comes out, I'll definitely make announcements through this mailing list, and will try to get some sites to feature it. Thanks for the interest.
Cheers