Any possibility to add planting as well?
Not currently, I don't think. I had that in mind when I started it, but after playing around with it a while I don't think it can be done properly in modding.
I can plant a tree from an apple. I can even have it take several years to 'grow'... but what I end up with is a single-use fake tree that disappears when you collect it.
It does work with regular trees though.
<Edit: There is the usual agricultural way, but I'm not sure it reflects trees very well either. I don't really like threshing apple trees to get seeds, or the idea of planting a tree in April to harvest it in August.>