I know what you mean about the "possessed by Khorne" thing. I think they were trying to include the "Tau violence of the past" thing; the "dark times" or something.
You know, before the Ethereals or whatever

.
As far as another book... It could be done. It'd have the same kind of standing as Cain novels if anything.
Kias was a little too
OP though. He easily took out everything he came across. Usually in a comical way.
Maybe they author took the games "other point of view" a little too far and made the book more of a satire.
Don't get me wrong, I liked the book. It made me laugh and it was a quick read but, after reading it I had to call
my best warhammer bro and totally rip it apart.
Off topic: Did anyone read the Soul Drinker omnibus? I counted around 20 typos in the first 150 pages. Terrible stuff.