Ever since I got this game if been hooping to one day build a nordic village and not have to make the buildings with only slabs.
Allowing the roof to be lower then -1 would allow for a more nordic roof over hang like this:
as for max roof height Ide like the game to allow us to peak the roof no matter the size, instead of becoming flat after 8.
I also have a more advanced idea on how smaller building could use roofs higher then 8.
Here it is:
As the roof goes higher then the needed amount to reach a peak it will start from the top and add on and extra layer thus making the peak even sharper.