Alright, you do you, to each their own and all that. Just whatever you do, don't make 3 cement mixers. It's the same reason why I would be against having 3 slot forges. Splitting stacks into odd numbers, now THAT is a chore. Splitting once, splitting twice, splitting thrice...
True, but managing forges is, at least as of A19, just that little bit more demanding than cement mixers. You have to manage input, output, fuel, ingredients... Cement mixers, you just have to manage sand, stone, and cement, maybe some sand crafting as well. I don't know why, maybe it's just me, but between the two, asking for a mod that increases the production rate of cement mixers just seems like fluff compared to the anvil/advanced bellows? Just my perspective. Besides, consistency and all that; what about mods for the workbench and chemistry station?
Now a mod to craft cement out of the cement mixer (but it taking longer than in the forge), now there's an idea... Coupled with your idea for the mod that allows to craft items faster... Nevermind, take back what I said. 😛