I would like to add a bounty for a question to make it more attractive.
But I can't, because someone else set a bounty.
Conceptually I see no problem if I add my bounty to the question to reflect the higher interest in form of a Superbounty or Multibounty.
I like to add following example: "A user awards 50 bounty to a question. 10 other users like the question and think it deserves more bounty so it be answered more likely." -> Currently, the bounty would be 50 while the actual interest is rather >200. So this question is undervalued. If every user can only award 50 and needs to wait for a week for the previous bounty to vest, the question may remain unanswered and undervalued for the entire time.
The easiest way would be to let users just add their bounty leaving all else equal (the original bounty offerer still distributes the entire bounty).
Can you please add the feature for multiple bounties?