--Smoke grenades; all that use of SMOKE must seem gratuitous to the global warming people and may well attract their ire. While carbon foot print tax could be added via mod in purchasing the grenades, making them more expensive, maybe a -5 to score each time a smoke grenade is used to simulate such aforementioned global warming ire. This would give the player motivation not to rely on smoking everything but try other types of tactics.
(Hmm can score actually be lowered via mod in purchasing a certain item?)
--Lower score for property damage, certain terrain tiles destroyed by your soldiers counts -5 or something , we like to blow things up but the farmer /citizens might not be pleased to return to a cratered ruin of a barn/town. This would give the player an extra challenge to overcome, that is not to bring the Rocket tank to terror missions and rely more on AP to avoid collateral damage.