Golden rule: If both players agree, then have fun.
1) 100% Official
PDF - FAQ 2.2 (October 10th, 2016) Link broken, will try and find new one.
2) The game is dead, so we are not getting nice things anymore, but the people in charge are nice enough to tell us things - Official:
Herald of the WAAAGH!
3) Unofficial Joint Fan Made FAQ/Errata