yes, there is a MouseEvent for right click. its MouseEvent.RIGHT_CLICK or "rightClick". MouseEvent.RIGHT_CLICK will not be highlighted in the Flash CS3 IDE. at least it doesn't in mine, but the code does work.
of course, tracing doesn't work testing the app normally. press <ctrl><shift><enter> to run the debugger where it will trace the message.
for the most recent AIR (in Flash) documentation, go to http://help.adobe.com/en_US/AIR/1.1/devappsflash/
and in regular livedocs flash documentation a
will be next to any property or method that is only available in Adobe AIR.