So, here's the part that confuses me: the Weapon Training talent is all about being able to use a set of weapons without a penalty to your Ballistic Skill roll. But for flame weapons, you don't even *need* to make a BS roll, nor is there any listed penalty I can find for not having it. As such, I currently have a Ministorum priest running around with a chainsword in one hand and a flamer (not hand-flamer) in the other, and technically there's no penalties to be found.
Is this just a blooming oversight on FFG's side? I didn't even see it addressed in the FAQ/errata.