Placing ID into science class has nothing to do with questioning evolution. No evolutionary scientist I know has a problem with students asking questions about evolution or discussing difficult areas. ID is about getting God into science, starting with the school system.
ID is not a science. It has no theory, it can not predict, it is not falsifiable. Why would any one want to place a non-science in science class, it makes no sense.
If, and this is a pretty big if, ID ever develops into a science, then propose including it in science class.
And, of course, a sticker calling for open and critical minds constitutes teaching ID and violates the First Amendment, right?