I think it would be interesting if each command station research gave the home world a foldout or mini-command station that buffed the system, such as researching some cmd station mk 2 will create a mini station next to the home world command station. The station would produce an effect similar to the effect of the station, and also improve the economy similar to the effect of the researched station.
So, with unlocking econ mk2, you get a mini econ mk 2 on the home world, which produces extra resources.
Unlocking econ mk 3, either replaces the mk 2 or adds an additional mini econ mk 3, which produces more resources.
Unlocking military mk 2 gives you a mini military mk 2, which gives tach coverage and fires damaging shots.
When destroyed they drop remains.
Also,
And in addition that that.. maybe Economic Command Station could make building or repairing units or whatever on that planet 10%/20%/40% cheaper?
You do understand that putting all your production on some planet with adv fac and such thing would basically be equal to a GLOBAL 60% (for 40% discount) bonus in resources?
It's not a 60% bonus in resources. It's a 40% bonus in resources.
Here, an example, you want to buy something that normally costs $100. There's no discount.
$100 spent. $0 left over.
Effective resources: $100 (spent) / $100 (initial) = 1.0
You want to buy something that normally costs $100. There's a discount of 40%.
$60 spent. $40 left over.
You spend the $40 on something else (no discounts, yay easy math).
Effective resources: $140 (spent) / $100 (initial) = 1.4
1.4 = 140% normal = 40% bonus
Don't forget to spend the extra 40 dollars on stuff at a 40% discount. I would assume that if you had a 40% decrease in spending, you would always spend there, given a choice. Also, you spend 60 dollars on something that cost 100, we don't care about the leftovers.
The correct equation to use is:
c = (1-d)*e
c = cash to spend
d = discount
e = effective cash spent
c = 100
d = 40% or .4
100 = (1-.4)*e
100 = .6*e
100/.6 = e
e ~= 167
efficiency = e/c
efficiency = 167/100
efficiency = 167% increase