go to
www.geocities.com/jandrall for gadget recipes. He can also make doubleshot and tripleshot crossbows if the engineering skill is high.
Keep in mind, Madras will not go into Rapax Rift or Bayjin. I tried a party with no Gadgeteer and using Madras, but you can REALLY use him in those areas, but he won't go. I prefer to have a gadgeteer in the party.