With college over I finally had some time on my hands so I decided to take a day to tackle some of those damned mutant trees. After some testing, I've finally managed to produce a limited test "patch" to alleviate some of the problems.
It's limited in that it only affects the trees from tree_f.brf. Other objects such as tree stumps will still look odd until I or another person focus on them.
Download here:
https://mega.co.nz/#!rdpVnTqI!NT1y_OZ5tIL5s_-vZKy78wUtFCHVfFB8jatv_PtQVYM
Simply extract you your Brytenwalda folder.
Feedback would be very much appreciated as this was done by a blind newbie. When it comes to modding this is the first thing I've ever done.
Ever. I wouldn't be surprised if there was a much easier way to do this and I just happened to do it one of the most brute force ways possible.
How to quickly see the effect of this patch:
Before you install
Make a new character as a Briton. Choose Alt Clut as your starting town. When the brigand attacks you in the streets there will be a tree from tree_f behind you. Without a patch, it should be a half-birch, half-normal mutant tree.
After you install
Do the same thing. Now the tree behind you should not have any birch features (although it is a bit blurry)
If you don't want to overwrite your module.ini then change the following lines in it
load_resource = textures
load_resource = materials
load_resource = tree_f
to
load_mod_resource = textures
load_mod_resource = materials
load_mod_resource = tree_f