Hi dodo.the.last, thanks for creating this mod. It's nice to see someone on the side of the trees!
I'm currently running v4.5.1 of the mod, and I've slowed down the "Progress rate" (aka "Spawn rate"?) to 500 as I was finding that I was getting A LOT of new trees. There's no problem with that.
But one thing which IS causing me a bit of a problem is that trees keep spawning in the middle of stone brick pathways and roadways. I use these a lot to speed up running and driving around my bases, but it's a bit annoying when I keep crashing my car into a tree which wasn't there when I built the road.
Does Treeees take account of structures at all when placing a new tree? It seems a little unrealistic to me that a tree seed would be able to take root in the middle of a busy path or road. Perhaps this could be prevented by the mod? And does this also apply to railways? I haven't found an example yet, but is there a chance that a new tree might spawn on a railway track and cause a collision?
Thanks for taking the time to read this, and thanks again for creating a very good mod.

Apologies for the mess. I hit the 'quote' function by mistake when I wanted to edit my post. :-(

Hi, glad you enjoy the mod.

Trees don't have a problem growing on a cobble road. Have you tried using concrete? When trees try to spawn they search for tiles with suitable soil and for a non-colliding position, so they don't spawn on entities like rails or other kind of structures.