Firefox users only, the rest of you are screwed I guess. Sorry.
First, make sure you've opted out of it, because otherwise you won't be able to cross post. But who really wants that?
1.
Install Greasemonkey as an add-on. 2. Then go
here and click the green install button.
That's it. The options to cross post in comments goes away and you can't check the boxes when you post. The end. Hope this helps.