Empire at War
The name might be a little misleading for you, it was for me. It's for customizing the number of units allowed on the battlefield. It gives you options for all three factions in both land and space.
It also allows you to change the planet cap in GC, although that can get a little buggy because it doesn't change the number of slots you can see. But it is easy to use and works as longs you point it to the right folders. the_stag