You can jump on lineage II, it was a function which was USED on oficial server, but removed on the updates. Lineage II uses Unreal Engine, which is the engie used on a FPS game called Unreal Torunament where you CAN jump, if you open the files of Lineage II you will see in some places the JUMP functions but are all disabled, the anymations can be done so it isnt a problem at all. I get what you say, but you arent right