Board Thread:Questions and Answers/@comment-70.31.139.90-20130701230202/@comment-5627887-20130702141932

As far as I know it shouldn't bug, I think it was just disabled for much the same reason that there's only one type of copper and tin ore in the worldgen; it would complicate things without giving much benefit. However, having tried the MFR rubber trees in the newest Tekkit, I prefer them to IC2 rubber trees, so I would probably prefer them in the worldgen on a new map.