An additional note from someone who has had to navigate the parks in a wheelchair for the past few years - when we went to the Star Tours special day for PAPs, they had us go thru the regular queue, then wait until they told us where to go when we got inside. From there, we had to go to the front row and go all the way to the end of the row for me. This was not good for me, since it was much too close to the screen, there was a lot more movement in the front row and being that it was way off at the side, I got very nauseated from all the movement and trying to watch it from way on one side.
For scooters on the other hand, they let them go thru the exit. At first, I couldn't figure out why we couldn't go that way as well, since the regular queue is all switch-backs, but when we exited the attraction, it became obvious. You have to do DOWN a ramp when you exit, which is no problem for a scooter, but much harder for someone who is pushing a wheelchair, if you were to enter that way.
I don't know if things have changed, since it's been quite a while that ST has been up and running, but in case it's the same procedure, I wanted to let you know what we had to do in that situation back then.
I hope you have a good time, but also be prepared to have a lot of rude people running into the person in the wheelchair, pushing their kids in front of the wheelchair to run in front of it, or "grown" people running in front of it, etc.
It has gotten to the point that if the park is too crowded when we go in, we don't end up staying very long, due to the rude people who don't care and/or don't watch where they're going. It's a good thing we're PAPs, since we don't have to care how long we stay in the parks at any visit.