There's nothing the game needs, so far as I can tell. But, hey--TPTB came to me and said we had to tweak the show, here's what I'd add:
End of Jeopardy!, add a bonus answer. Player in the lead has first dibs; if s/he misses, it goes to the player in second, then the player in third. (In case of ties, the last correct questioner among the tied players goes first.
Question this answer correctly, you win the bonus: your choice of a prize or a dollar amount to be added to your score. (I'm not sure what the dollar value would be, or if it would be a set amount or an escalating value.)