ofxOpenNI best practice questions

Hi all,

I am designing and developing an installation using ofxOpenNi for tracking people in a exhibition space, I need to implement continuously skeleton tracking for one user at a time.
My question is which is the best practice to obtain this behavior?

At the moment I have experienced some (I guess well known) problems:
after having tracked some users the software stops working, it looks like a timeout occurs before the system begins tracking again. The insidious problem is that if an user stands in frame during the timeout the software doesn’t track anymore.

Is there a way to force openNi to stop tracking? Is it possible to reduce timeout duration?

Thank you a lot for any help and for sharing ideas!