There is so much insanity and stupidity in the iPad and iPhone forums right now, we desperately need a "hide thread" button so I don't have to constantly see 5 year olds whining about this and that.
The best you're going to get is to hide forums from the forum spy listing.
But if we have the ability to block users, doesn't it make sense to have the ability to block threads?
Sure. But the forum doesn't have that functionality.