I don't know if this has been discussed before on some other site.
Often I feel like putting a bounty on questions (usually my own) questions, because they are based on optimisation and better solutions could be found any time. Then I often decide not to, because it is possible that no solution comes up in a single week, or that not enough people saw it.
Can we have a tag named "promised-bounty" to indicate to all users that a person has promised a specified bounty, if ever an answer meets certain conditions?
This would especially be useful on newer sites (like Puzzling SE, and maybe even newer than that), where people don't have too much rep to waste, and readership of questions is low.