Re: Self appointed Mythbuster to the rescue!
"And unless you have Pro or Enterprise you don't have GPedit and cannot rate limit the downloads."
Even if you have Pro, it looks like it just ignores that setting now. My box is set to 128kbps, but the other day I spotted it doing 5mbps (which broke web browsing, which is why it got set to 128k in the first place).
I've not done much testing, but it worked on 1511, and doesn't work on 1607. I suspect their changes that stop the Store blocking GPO working on Pro may have broken BITS too.