I want a really simple mod: make the toxic waste dump accept/destroy local trash the same way the federal prison can store local criminals. The trash capacity should be at least as much as a waste-to-energy facility, to possibly 3X as much (the same way the federal prison = 3 normal jails).
I'd also like landmarks to be made functional: The natural history museum being an educational building, the fine arts landmarks being educational buildings, the world cup stadium being a recreational building, etc.