We had open house at the school tonight and I got to talk to the teacher. She is genuinely interested in what we want her to do and what he needs her to do to keep him from being bored and to challenge him. I don't know that we settled on anything in particular tonight, but I told her if she can get him to stop saying he hates school by the end of the year, it'll be a miracle, and she said that's her challenge now.
He really doesn't hate school once he's there, he only hates it when he's at home and having to think about it in some way such as what happened that day or taking a bath for school tomorrow or it's time to get up for school.
On a good note, she says those "Math Minute" things are only filler because the math book's homework doesn't begin until the 11th day. Of course, that will be Everyday Math homework, so it won't improve much, but oh well.