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@Hepps I recall that, back then during early development, I reiterately tried to have Imbaked making the gas into a tech, like tanks. Instead, he insisted that he wanted gas available since start game, but I don't recall what was his reason for it. The problem with techs that unlock units is that they have a fixed cost for unlocking, thus they induce spam, by making the unit relatively less expensive the more you buy it (as the research cost will be divided amongst more TUV, lowering the markup). So, basically, the risk is that either the tech is not good to get or once you get it you need to spam it a lot to make it worthwhile. This is likely the root of the problem of the current NML Mustard Gas and Working Women tech combo.
With this said, unless the map goes a bit the way of Civil War, and you have manpower vs manufacture, so that, for example, you cannot spend all your income in spamming infantry (hence the gas would be alternative to other materials, not much to infantry, reducing the need of having a quite strict mathematical comparison between the TUV cost of the gas and the TUV cost of the infantries it is going to grind down), I would rather suggest gas being limited by the number of targets, that would represent the fact that is not a weapon of annihilation. Regular gas may hit at 1 and mustard gas at 2 (and possibly another level of gas that hits at 3), and only infantry or infantry-like units, with possible maximum rolls limited to the number of targets (as said). However, the problem with this is that, then, you may end up just sending exactly a number of gas equal to the maximum hits you can roll, each time, that would be some dumb management. The best would be that gas has a sort of mechanics that becomes less and less effective the more you use it on a same target, and the more effective the bigger the target.
