Maybe ask the people who released that for FS17? It's called 'Growth Control' The seasons guys have enough to do as it is.
Enough to do, provided that making that micro plugin is any work at all. I know bugger all about coding, but given that the feature is as part of Seasons, it stands to reason it is already coded. In my amateur mind, it seems as simple as compiling the few lines that force the game to do that into a separate mod. Feel free to correct me if I'm wrong about this. Also, no need to get all uppity about it. I was just asking.