I would like to suggest introducing the option to utilise one of the leader skills of the other team members.
Not only would it make the game much more fun, it would also add an extra element of strategy/tactics because I can't count the number of times I need 3 or more different skills at the same time but have to settle for just 2 that aren't really up to the task.
Any worries of it becoming too easy or teams being overpowered could be negated by making the leader skill of the mid - team member operate at a percentage of it's original power, increasing it's countdown or any other limitation Playmage wanted to put in place.
I just think this, if implemented properly, would make every fight so much more interesting.