Not long ago i learned about this https://en.wikipedia.org/wiki/Pollarding its seems like a good idea to increase the bough yield of trees at the cost of wood.
i don't know how posible to do this is, but it could be an interesting thing to double or triple the bough yield of trees at the expense of them dropping either one log or just a couple of blocks when you chop them down.
btw its my opinion that either the skill or the option to pollard the tree should be usable only when the tree isn't fully grown. so you can't go around pollarding wild trees, to avoid people getting wood around your base or theirs.