Many corona users ask for simple and robust scene changing library. There are a number of problems with original director class (no offense), that's the reason why SceneManager appeared and now this module.

It's very small, fast and effective. For those who know what are they doing:
http://developer.anscamobile.com/code/director-class-24-lines-code

Also don't forget about my module for managing timers and transitions (play/pause, change speed).
http://developer.anscamobile.com/code/pausable-timers-and-transitions-speed-adjustment