This is a very intresting mod which adds quite a lot to the game. It deserves a longer description in the first posting and a few screenshots that show players what to expect :-) Else readers might just move on to the next topic and never realize what they miss.
Unfortionately, mapgen is extremly slow. There are alternatives to lua voxelmanipulator which may speed up tree generation considerably. One is
L-System, which is used for example for the huge trees in the
moretrees mod. It allows each tree to be individual. The other option are schematics. Those are used for example for the trees (and other structures) in the
ethereal mod. Schematics have the advantage that they can be placed very fast and easy, especially with mapgen v7. See ethereal for that. Of course they also have a disadvantage: Tree shapes may be less diverse than with L-System. You may add a probability for a node to appear when the schematic is placed - but that's about it. Astonishingly enough, that is enough. The trees in ethereal look convincing, and the ones in
RealTest do as well. RealTest does not use schematics, but the trees are always the same shape depending on species. And it does look well enough in the "world".
Another point are the wood colors. Yours look very realistic (perhaps the cherry wood ought to be darker?). I'd prefer a diffrent approach here - more like the one in RealTest: Distinctly diffrent colored wood to build with. In reality, we usually do not build with plain wood, but put glaze and paint on it which makes the wood look pretty diffrent. With diffrent tree species, the wood colors can be exaggerated so much that you don't need any extra glaze anymore and can build nice houses.
Turning the mod into a modpack would also be nice. That would allow to use the trees (you can never have enough trees in a world :-)) in combination with other mapgen mods and in other worlds.
And please add screenshots to your fist posting :-)