The simplest way is to check if the camera's position or direction has changed and adjust the quality accordingly.
Current CameraController doesn't provide such functionality. Moreover, it wasn't intended to be a for-any-case-solution, but a simple way for developers to make a camera alive till we'll implement a convenient controllers' system.
But your idea is interesting and I think that CameraController will be improved slightly in the next bug-fix builds of the library.