rtholmes, I've tried that in various ways, possibly using an earlier version of the WebWorks SDK, but had no luck. Even hacking it directly into the AS3 launcher code didn't have the expected effect, and I wasn't able to figure out why at the time.
I *think* it may be because the QNXStageWebView runs full-screen, and when it does that the AIR systemIdleMode value has no effect. Presumably at that point it would have to be handled with something in the native code that QNXStageWebView is made of, but if they haven't exposed anything like that you'd be out of luck.