Other mods probably don't have anything to do with space combat and there's no saber combat on these maps, so there's no need to run another mod when running these maps. If it's just an admin mod, this mod comes with the most desirable basic Admin features.
If you try to run these maps without the mod, it simply will not perform correctly. If the maps even run at all, the asteroids map will be so laggy it will be unplayable (the original implementation of the asteroid field was not network-friendly). The vehicles will not behave as they should, you will not get proper kill credit, the "Siege Destroyer 2" map will make every client who tries to load it crash horribly, etc, etc. These are not optional fixes that were put into this mod.
You MUST run the mod to use the new ships and maps.
If I could make this an official patch, and drop it all in the base folder, I would. But I can't... Besides, having tons of extra pk3s in your base folder will most likely conflict horribly with all the pk3s that will come with Asteroids. Putting it in a mod dir will help this some (since mod pk3s will always override base pk3s, regardless of alphabetical order).