However, I suppose that in addition to the known mechanisms, some very crucial other mechanisms might be operating to guide the wheel of evolution.
Biological systems are chock full of homeostatic processes. And homeostatic processes are adaptive.
I would not call that "missing" - biologists are well aware of homeostasis, and it is part of the background of biology that is subsumed into evolution. However, that might be what some of the critics of evolution are missing.
Fundamentalism - the anti-American, anti-Christian branch of American Christianity