Please note: There is a line between making suggestions and being insulting. If your comments are insulting to me, or any other student, I probably won't be all that receptive to what you have to say. Anonymity is supposed to help you be honest, NOT to enable your trolling.
Also note: If you mention something that is of global concern, I will probably address it globally, in class. If you don't want me to do this, you should note that in your submission.