I have seen some posts which mentioned they want only a hint. They want to think about their problem and solve it themselves. Nevertheless some people give an answer, good or poor, even Op insist to it just want a hint, and we post an answer with starting "It might be useful . . . " or something like this. We don't wait for one or two days then give the answer - perhaps for vote -. For this I think it might be useful to have a tag (at the first of tags) name "Just Hint" or "Just Hint please" respect to OP.
Also it may provide by site lock the answer box for some day :).