I would not mind tagging questions as closed, so that I can put closed in my 'not interesting list' and ignore them. It's kind of a hack to save those micro-seconds I spend on closed questions. What do you think?
What if a closed question already has 5 tags?
These things belong in the question's title, like
blablabla [on hold].
Since the idea is to have these questions show as "not interesting", perhaps there could be a feature-request made, to make questions with one of these statuses show up faded in the questions list, like questions tagged with "ignored tags"?