[Mephisto]

I still don't see why you all want to split the "conditions" field into different variables like gravity and radiation only to manipulate all the variables again with one facility. I do however think it would be nice to have the "conditions" field related to a race, not to all races.
The "ammo" thing would be nice IMHO and I have thought about it myself some time ago. I think "ammo" or better "military stuff" (small weapons, personnel, ship weapons...) could be the 4th resource, but could not be harvested but must be produced with the other resources. It would be stored like all the other resources and distributed over the resupply bases. Further, the actually demand for "military stuff" should exceed the possible production in a large war so that you are forced to think about building new ships or resupply your fleets. Further, an ally could actually help you in a war with delivering supplies and would not be forced to enter the war (like the US supported England in both WW). A superpower could easily fight a war through its minions this way without ever firing a single shoot itself.