Current teaching evals fulfill the role to valididly and reliably measure 'teaching quality' (and fail at doing so, arguably). The construct 'unethical stuff' isn't part of the 'teaching quality' construct imo. I would measure this separately.

As long as feedback loops work as expected, I agree. Often students are intimidated to fill out the evals and honestly believe these go nowhere. I also agree that public statements/grading about any professor must not be done anonymously.