A simple solution for on the way to the parks is to document it and report it to the front desk, best if you have video of the driver refusing. Generally the front desk will then call an accessible Minnie Van and pay for it. DH read one story where a lady kept getting refused constantly and was so much in tears that the front desk comped an accessible Minnie Van for her entire stay. Obviously that isn't sustainable if this happens too much, but once Disney starts loosing enough money on it, they will come up with a sustainable solution.
As for parties with too many people, the rules need to be enforced, obviously occasional exceptions made for those with young children, etc. But person using the mobility device + 3 additional companions seems perfectly reasonable.
As for parties with too many people, the rules need to be enforced, obviously occasional exceptions made for those with young children, etc. But person using the mobility device + 3 additional companions seems perfectly reasonable.