At the moment we have a relatively new economy overview screen that displays all your buildings and their production contribution for any particular resource. You can click each of these buildings to jump straight to them... for upgrading, stopping and starting, demolishing etc. But this closes down the the overview window and you then have to click through it all again. This is inefficient if you are producing +8k coal (eg.) and you would like to slow down production to +5k.
It would be useful if there was an efficiency slider built into the economy overview tool that allows for production management. Instead of shutting down individual buildings to balance production the slider would slow down production by a certain percentage for the whole group of buildings. So if you did have +8k coal but want to slow it down to +5k then you'd set the slider to approx 62%. Of course the slider should, to make it easier, display your desired production rate and not the actual percentage - so it would be in a range of +0k (OFF) to +8k in this example.