Bonus dice on Attack Action VS Flurry, Richocet and Doomsday Chair

[Tommy_DOOM]

Hello, we already learnt that you need a card/power that specifies attack action to grant a bonus to all the attack dice on a Beam and on Area attack but is the same if I boost with an attack that grants flurry or richochet or Modok's Doomsday Chair?
I'm asking this because in the case of a beam or area attack, while we resolve every hit character as a separate attack, all the targets are already estabilished in the beginning. Instead until now attacks caused by Flurry, Richochet or Doomsday Chair's second attack are resolved after i'd say, so not so sure about them

[Negoldar]

Extra attacks generated by special rules like Flurry and Ricochet would not be affected by rules that added dice to the first attack.