Star Strike by Ian Douglas
I've been reading a book by an author with the pseudonym of Ian Douglas, Star Strike. In it there's a rather interesting vessel, the Hermes which was previously named SkyBase. This vessel has the capability of phasing out of normal space into "paraspace"/subspace/Dirac Sea/etc and instantaneously transporting itself anywhere in the universe so long as the gravity well it is jumping to has been mapped. SkyBase/Hermes is capable of carrying almost half a dozen capital ships along with it in these instantaneous jumps, and then deploying them almost immediately. It would be fairly cool if a mod or a next version of this already awesome game were to incorporate this vessel type - it would certainly add a tactical advantage immediately to an otherwise lost battle or colony siege.