dont know what crewskill your whining about but as when i do archeology, i am able to send 1 character at a time for a specific crafting material. it is designed so that you cant just send all 5 companons after 1 item. that would unbalance mats ina big way hence why BW did it the way it is.
if your so much in need of specific materials, either buy off the gtn or go farm them the old fasioned way(run around a planet)