When I'm playing against the Hive (my buddy -loves- them) I set up about a dozen fleets, all with jammers, set to hit a dozen different colonies all at once. Most of the fleets just have a jammer and a few token combat ships, but there are 3 main fleets with the actual attack forces. He calls it Lizard Roulette because he never knows which ones to defend against and which to ignore. (lizard because I play Tarkas a lot)
If your playing as morrgi then it's possible to build a fleet which moves faster than the distance of most scanners so they don't get the one turn warning before you arrive. This also stops the hive intercept tactic
This is also possible with Humans, and I also believe Zuul. If the planets are particularly close, its even possible with Tarka I believe. Liir get slowed down by the planet unfortunately, and its pretty rare, if it happens at all, they can arrive in one turn. But generally, once anti-matter stage is reached, the Hiver better be winning, or their going to be hard pressed to defend all their planets.
My own strategy against the Hiver is to simply have a fleet go to a planet destination that is beyond the intended target. Once its in range to reach the target and one or more other colonies in one turn, I divert course to one of those colonies. This only works with Tarka and Morrigi, of course.