These features are already built into the game. For energy, build Boot Camps (+1 energy/8hrs), Factories (+1 energy/8hrs), and Test Sites (+2 energy/24 hrs).
Build enough buildings (i.e. HQs) and you will never have a supplies problem. Infact, I recommend players aim to replace all there drop zones with buildings at some point - it just takes a ton of building materials. Find your balance between supplies and energy.
If you cap your supplies inventory, there are nine or so cities you can convert supplies into cash with. If you need supplies - open the winter maps - the cities there convert cash to supplies.



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