Actually it wouldn't be all that odd. For the motherland has debuffs after it and you have to pay 150 munitions to use it.
still for the motherland is a commander ability not a units vet ability.
i still think move it to unit ability could be reasonable and make it only able to go forward like CPU-easy said and complete disabled if engine is damaged and maybe even a debuff after using it like overdrive. and give something else as vet ability like target weak point or an ability like explosive round to anti building and infantry most vet ability in COH2 is quite uesless anyway