The four icons at the top right of the editor that allow endusers to upload media do not match up with allowed upload types. For example, if you disallow mp3s, movs and the rest, you still get icons to upload Audio and video. This will create confusion for those endusers who continue to upload disallowed filetypes, get the "Doesn't meet security settings" and wonder why if they see an icon, why isn't it allowed.
Considering how many file types there are on the net, I have to admit that I don't see a way of creating a filter that would check to see what file tpyes are allowed and, therefore, allow which icons to display. Also you may have confusion as to what type of file does with what icon. (ie Which one do you use for *.txt files? Is the mp3 audio or video? etc.)
Maybe four sets of on/off switches in Site Admin -> Options to choose which icons to display?