I'd like to see job-specific idle poses.

Would be nice to see the blade classes (PLD, DRK, NIN, WAR) sharpen their weapons on a whetstone.

Monk could meditate. Bard could act like he's priming an arrow to be fired or aiming (wouldn't want him playing the harp since that would get rather noisy with a group of bards).

Black mage could do the fire magic in the palm of his hand a la human torch from fantastic four

Not sure about the other classes since I haven't played them...but you get the idea!