I was researching whether "add a preview to the comment window" had been asked (it has, at least once, here) and when I found the answer I found myself wanting to bump the thread as I think it would be a useful feature (and I hate it when you forget one character on a link!). However, SE doesn't allow that (afaik).
Given that the question had been answered, I only wanted to revisit it. The current SE model is ask-answer-idle. What about re-opening, especially for meta, questions? Perhaps a new privilege?