Block them..that's what I do when someone has annoy Q's or Q spamming....then I might lift the block another day IF I feel like it.
I'm not sure but I think that if you block those users their questions will not show up on your screen. Their replies to someone else's question will appear. Try it and see.
Unfortunately ....thats not possible
Nope ...I STILL see their Qz
Well , not for me , I block , but still their Qz ..oh well
That'd be cool. And also give us the ability to shut down receiving random pm's altogether.