One of the team leaders I work with on a mod is an avid Maya supporter, and when I did those low-poly trek models a while back he advised me to port them into Maya and UVW unwrap there. Among the options was a cylindrical unwrap, which I used to do the secondary hull of the Ent class. A model I'm working on now has cylindrical parts, and I was wondering how to deal with that in Max. There are Plugins for it, but I'd ask only for better options for unwrapping (such as the aforementioned cylinder) if Max can't pull an equivalent.
One thing to point out about the single-texture deal is that Sins of a Solar Empire's models are supposed to be done on all one texture sheet. I imagine it would be easier to port your models over to that game with this arrangement, if you ever felt about venturing into modding that way.