I also believe Darkseid is unlikely to want to waste time with a bounty hunter wanting to his head. He would probably Omega Beam Lobo into another galaxy or period of time...
... Although maybe Lobo would be capable of returning to his own time? After all, he smelt his way out of Destiny's Garden. And when asked how he achieved THAT, he replied "What did part of "best tracker in the universe" you not get?"
@Cryo123
I second Tupka's recommendations.
"Superman/Batman: The Supergirl from Krypton" and "Final Crisis" are another stories where Darkseid was a major player.