Just to get his powers under control so he can control the "connection" ability. The ability to force that onto others would be awesome, and if Crazy Train applies to force weapon rolls, then we've just found the ultimate anti-Daemon weapon. Having a personality is optional, so long as we retain the ability to point him at things and access to the ship/supertech. It's cold, but... he could be very, very useful to us. And honestly, with his power under control and other people around, he would probably be a lot happier than he is now.
Given time with Mirande and some good psychotherapy, he could probably recover some personality elements, to boot.