This mod lets trees fall when you fell them. It uses Create Aeronautics Physics library Sable. You can configure the amount of force applied to trees when manually felling them or blowing them up.
Using pistons to remove parts of the tree won't make them fall, as well as other block events such as fire.
(A mod config option in 1.10 of the mod can change that, but it has a significantly higher performance impact than not checking for each blockupdate)
It only reacts to players or entities removing the block as well as explosions.
