Maybe a bit late, but if anyone wants to reftrofit their character:
I'm thinking of introducing a Leadership skill (Charisma-based, may be used untrained) for getting groups of people to obey your commands. Success means that they do what you want, failure by 5 or less means you get some of what you want, failure by 5 or more means refusal. Depending on the situation, this might not occur right away - the group may agree, go off to perform the task but not actually do so. You can Take 10, but not Take 20.
DC depends on how difficult and/or dangerous the task is. Circumstantial bonuses will apply, including such things as morale, general loyalty, characters renown etc. As well as, obviously, commanding troops this could also be used with teams of craftsmen etc.
Some traits could apply too: Born Leader means you have a natural aptitude for getting people to agree with you, gives +1 to Leadership and Diplomacy; Demagogue is the art of giving people what they want, gives +1 to Leadership and Sense Motive; Commanding Presence gives +1 Leadership and +1 Will.