I like the idea... I think it needs just a bit more developing.
I mean, If I find a member irritating or ignorant, I would love to have a button that I could switch on, and then I could ignore them... but it might make a topic a little hard to understand.... like if that member makes a topic about something you are interested in... and then you can't see the first post so you are like "WTF???"
Also.... it is a bit unimportant.... If you don't like them, don't read what they post, if they flame you, report them.
There are a lot of flaws with this, think them out a bit more.
-Sk