As far as special ways to use him, I highly recommend taking a peek at this article HERE on Kirby's blog. It has a very good Fabius Bile list with it as well, and goes into a bit of depth about Bile himselfI've been thinking about getting Fabius Bile.
He sounds real good, with average rolls he can bring down/wound a Wraithlord, other MC or a powerful independant character.
I have a couple of questions-
1.Can Fabius Bile enhance himself if he's in a squad?
2.Can Fabius Bile ignore armour saves?
3.Does Fabius Bile have FNP?
Does anyone know any good tactics, any special ways to use him or just anything about him in general?