One additional problem with throwing is that there is no item difficulty based maximum PT bonus. For archery it is (difficulty +4). So with PT >10 stones become simple too effective although they are meant to be a peasant weapon.
I have a character which I designed to throw rocks, and only rocks. While I can get a rare kill with rocks, only the radically insane, formerly dropped-kicked children, and the mentally handicapped would ever willingly choose to use rocks as their primary weapon. On the NA servers, I am currently the only radically insane, formerly- dropped-kick child, mentally handicapped person who uses this play-style.
I don't understand the reasoning behind nerfing a highly inefficient weapon. To be honest, I think that if a dev is of the mindset that rocks are too strong, you should be completely removed from the balance team.
Are they accurate with high PT? Yes, but anyone with 0 wpf in crossbows can pick up any xbow and be more accurate than a 10 pt thrower chucking stones. Are they damaging? Fuck no! Most of the kills on my stone-chucker are from barely-living disemboweled peasants who have lost the will to live.