ok my 2 pennies!!!!!!
ill use fuel as an example in this one but can be used for all factories.
fuel factory supplies fuel, it has NO effect on fuel at a base.
factory can supply fuel at 1,000,000 gallons an hour.
each field can hold 100,000 gallons
spit holds 40 gallons of fuel with DT.
when spit takes off 40 gallons are deducted from the base store so it comes down to 999,960 gallons
a b-17 takes off after the spit which holds 100 gallons so the base store drops down to 998,860 gallons so on and so on.
run a fuel convoy every 10-20 mins to re-supply the base fuel store to 100% available fuel.
if you take out a fuel dump at a base ( assume there's 4 ) then base fuel store drops to 75%, now this doesn't mean planes can only have a 75% fuel load out but the base store only has 750,000 of fuel available. if all 4 dumps are destroyed the nothing can up till base is resupplied (max 10-20 mins). possibly a small "reserve" of around 10,000 so at least some planes can up for a while.
if the fuel factory is down to 50% capacity then it can only supply 500,000 gallons of fuel an hour instead of 1,000,000
the way i see it this will have 3 different ways to hamper fuel.
hit the factories
hit convoys (adds a new dimension to game play)
hit fuel dumps
most fuel dumps in fixed bases where hardened or under ground so strafing them will have no effect, would need 2,000 lbs of ords to destroy them.
the fuel figures i pulled out of thin air to give an example.