I consider the refusal to answer a question asked, by someone seeking help, as bad manners.
Hmm. Not in a forum context, I think. It would be incredibly worse if everyone who didn't know the answer posted a polite "I'm sorry, but I don't know the answer to your question." The sort of "question tracking" you're implying should exist is characteristic of a "customer support" organization with paid employees and a lot of infrastructure. I guess google code and/or Sourceforge has provisions for bug/question tracking, and might be bent into such a purpose, but in my experience you're less likely to to get meaningful responses there than in Arduino forum anyway, even to real bugs.