Get off my lawn!
The explanation: Impossible Triangle + TW (my company initials) = my logo.
Can you play Double Saucy Sue cards as many times as you like? In other words, could I play 3 pairs of Saucy Sue's to move her entourage as a group three times in one turn? Then say play another single Saucy Sue to move her singly one space?
The only limitation is that they are all the same color, so yes, you can play seven Saucy Sue cards in the way you describe. With only an eight card hand, this is unlikely to occur in practice, but it is quite common to play a pair and then a single on the same turn to move as you describe (if not as far).