I know how fire spreads, as it doesn't matter if there is a falmable block or not within the flame up radius. This is exactly what i have problems with. Fire going through solid blocks that do not themselves catch fire. It treats all non-flamable blocks as air, including air blocks. Of course it will not set fire to those non-flamable blocks, but will go through those blocks to the next block if flamable.
My suggestion is simply the have fire not spread through non-flamable blocks to something that is flamable. I am unsure how exactly the programming part of it looks, but the way it works is kinda odd in my opinion.
In this way you could make a chimney of stone with a decorative wood border around the base. The opening would of course be at the top, even if it is 4-6 blockshigh of stone around 1 flame.
I don't know how any would even go about it in the programing to prevent this behavior or impede it when the flame is clearly surrounded by non-flamable blocks... Just and idea.
If only to at least have something like this on easy, so as to keep the other difficulties harder. Even make it spread more on hard would have the same effect...
In TU9 there's gonna be spawn eggs and griefers are most likely gonna spawn creepers and hit them and they will explode things like friends creations anyways i would love to have a mob griefing false/true thingy in the host options so that wont happen. Sorry if this didnt make sense.