[Spuzzum]

I don't think it's possible to mod it, but it's a good idea (I had a similar idea not too long ago, but didn't find a way to mod one).

You'd have to drop the standard planet population limits, since SEIV already operates under the assumption that private residences and the like are too small to be individually tracked in the game. For example, you could mod all of the planets to have a max of 5M population -- then players could either keep the 5M people on the planet and build lots of military facilities, or else build lots of civilian housing and get lots of population, but not much room for military facilities.

There's a wish list floating a few threads back, so knock yourself out! ;-)