There is no need for the computer to boost when it's idle; more than likely it will enter a low power state when idle to save battery power.
The boost is all done in the background without user intervention.
From most of your threads, I find you're worrying too much about the small things. Do what you need to do, and don't worry about the small details. The processor will "turbo boost" when it needs to. If you mess about with the boost you will find your battery life significantly shortened and your computer running very hot constantly (and probably with the fans going off at full blast).
Just in case someone else wants to dig in -- Intel CPUs have built in SpeedStep, which actually reduces clock speed to save on battery (a good thing!). The feature is also baked in the OSX kernel. http://en.wikipedia.org/wiki/SpeedStep