Coming though featured (bountied) questions gave me an idea: that would be really a gesture of ultra-fair play or "tour de force" (sorry for my english, don't know the right word for it) worth gold badge to upvote a competing answer when bounty is in place! Or, upvote
X such competing answers.
The badge could be named like Old Shatterhand badge - just an idea :), or whatever better name you can invent. It could be considered a gold version of Sportsmanship. Well, not exactly, for sportsmanship the limit is 100 answers, for bountied questions the number
X should be probably much lower. So one could end up with Old Shatterhand but not Sportsmanship then.
Or, which I like even better, don't put the
X too high but put even harder condition - upvote competing answer with higher or equal number of votes than your own answer. Before the bounty was awarded of course.