I believe they need to add additional job abillities that can only be activated by different jobs being in the same party, ie; warrior and monk can activate fighter's spirit. a abillity that causes a red aura around the effected jobs increasing weapon damage.

Some people have been talking about making meteor a combined spell but others think it would be too difficult to pull off why not have one person click on the the combo spell or abillity and have the game give a message. " Turtlebuddah is preparing meteor." that way when the other players see the message they know to activate meteor as well