Hi,
There's a chance, yes, but it comes with a big caveat. The new system that might allow me to do this proportionally is a 'startup' setting. Meaning every change will require Factorio to restart. It's a big pain, I know, but that's just how the modding interface works now.
And then... I need to do some research and experimentation to see if it will really work at least decently, and if that goes OK then I can integrate into the mod. Really a lot depends on how that goes - it could happen very quickly if everything goes smooth and easy, or take a while or not happen at all if things don't go so well.