Working on stats for the Immolator used by the Sisters of Battle. Any ideas on how to handle a twin-link for a Flame or Blast weapon? Such as the Immolator configurations using twin heavy flamers or twin multi-meltas.

Given the way they work in the tabletop, I'd suggest twinlinked flame weapons have to reroll successful agility tests to avoid the damage (possibly the flame... not sure on the balance there). Twin-linked blast weapons should be given the normal boost (in Dark Heresy, +20) as well as be able to reroll the scatter direction if it misses (if it granted a second blast, it wouldn't be distinguished enough from two separate blast weapons firing at the same time - again, balance).