Actually, if we're going to be adding tree types, especially odd tree types, then maybe it would be better if we were also being much more specific on what biomes those trees grow within?
That way, we don't have tropical broadleaf forests with the same trees as temperate forests, etc.
It would help reduce the problem of having 500 different kinds of wood in a single biome, so that any given biome would only have 3 or 4 kinds of wood.
Biomes are absolutely one of the things I plan on researching. I plan to make a table of the data we have now, mixed with the existing DF data and blanks for the unknowns and invite others to help me fill in the blanks over time. I went through the colors already, actually, but we might benefit from further standardization. For example, I don't remember if I always used the sapwood instead of the heartwood or whatever. And I used that table of DF colors. Some of them just didn't have great matches, so I took the best I could find. Maybe there are better ways to mod those? I don't honestly know.
My ideal would be a minimal set that accurately represents the big families of IRL trees for each biome, plus the most unique & interesting trees that add flavor.
Help, especially from mod-savvy people like you, is always appreciated