If would be nice to have a slider, to volountary invest into military training among the population. If would be REALLY REALLY simple:
You invest 400 bc/week into military training. ($ chosen with the slider)
you have 20 billion population
400/20 = +20 Soldering bonus for the next turn, as long as you keep spending the money, your soldiers can fight better.
It would be a good way for the A.I. who has too much money but not ennough soldering to be more efficient (Minor species, I am looking at you!!!).
and I don'T think that it would be really hard to encode in the game, when you think of it, except maybe the A.I. implimentation..
But what do you think of the idea??