Uh. Not sure. Either way, you could always request someone else repeat the question for you. Thusly, getting the question answered anyway.
I think you may be missing the issue (or perhaps you are just dead set on having the ignore feature, or perhaps I am reading the situation wrong, and I apologize if that is the case).
The feature itself may end up causing conflicts with one of the long-standing forum rules:
• Address questions given to you, either by answering them or saying why you won't (such as "I don't know," "I'm not comfortable answering that," "it's personal and I don't feel it's your business," etc.).
In the past, people such as Nautical and Skyfire (among others) would attempt to simply ignore questions that they didn't want to answer. This was especially significant during the Nautical mega-thread, as there were people on this forum (myself included) who were attempting to pin him down on his insanity. It is my feeling that this type of feature is really going to end up hurting some of our more interesting discussions, since a user can simply ignore questions and say "oh, sorry, had them on ignore". Alternatively, we end up with multiple people quoting every question, just in case. Especially considering that it is currently unknown if someone gets a notice when placed on ignore (in my experience on other boards, there is no notification).
I think that this is the kind of thing that should be presented to the board as a whole for discussion before a final decision is made. Unless, you know, we aren't that kind of board any longer and decisions are going to be made unilaterally. Which is fine, but also good to know.