An idea just came to me - won't it be possible to add a cost calculator in the game, so that the "cost" window in OOB gets free for something else?
Another idea, following this - would it be possible to make ammo loadout adjustable? Say OOB stores "typical" loadout and a nr of rounds and player would be able in the purchase screen to modify loadouts according to expected opposition (more HE in case of expected all-infantry force, actually in the discussions on Tank-net it was mentioned that in Chechnya a T-72 got into fight with Chechen T-72 and was loaded just with HE ammo)... With the cost calcullations being made by the game, the cost itself will alter to respect changes in loadout...
Now I won't it'd be probably very hard to do, as I'm not a programmer I don't have to restrict my fantasy in this direction by cruel reality
