Support abilities should affect non-alliance members as well.
A large part of what disturbs job balance in Frontline and Rival Wings unfair is that AoE attacks can hit any number of enemies but AoE support abilities, such as Magick Barrier or AST cards or Cure III will only affect party members.
Instead of stripping the fun out of the mode by introducing AoE caps, why not lift up some of the struggling jobs by removing this restriction? It would certainly help Bard, Red Mage and Sage, which are otherwise pretty useless.