Please, please, please keep the old code and make this a toggle. Even if it requires a game restart/going into the files to switch. I'll probably play through SA with this first but as a player I often find myself looking for additional challenges on subsequent playthroughs.

I see two sides to why this would be added; it gives players something to do in moments of down time & it increases resource consumption (at least in the short term). It also adds layers of math that can be hard to compute. Mods that plan this out go against the spirit that is factorio! Frankly ...