Expand your gaming!
During the operations phase, can the active player play more than one character card and/or support card from his hand?
As the previous poster stated, the active player can play more than one character/support card from his hand.
Can the opposing player then do the same before the active player commits characters to stories?
Again, a player can only play character/support cards when they are the active player. The non-active player can take other actions (Event cards, for example).
It's also my understanding that during the Operations phase, playing character and support cards are considered actions. This means that after the active player plays a character/support card, the non-active player has the opportunity to take an action (Event card, character ability, etc.) before the active player can play another action, including playing another character/support card.
EDIT: GO UofA!