Don't allow resources to be picked by anyone except the player & enemies.
By this change these kind of cheese strats won't work.
As Jadame said the only thing that would change is that you face multiple types of other units instead. I personally rather deal with one KT than with 3x P4s.
In addition I have a problem to put CP requirements on core units. Should you be punished if your strategy worked out well and you managed to hold both fuels? - I don't think so. With the armour nerf back then 420->375 a KT can be handled well with At Guns & Mines.
Did you see that my teammate was OKW player?
No supply drops in this game.
If you manage to hold both fuels, your award should be second P4, not KT.
Why won't we make IS2 non-doc as well? Or Pershing? Just make Lt, Cpt, Mjr and call Pershing.
Amount of whine would out of scale.