I read somewhere or other

that a rental scooter with cane holder on back
is a problem for bus loading. Is this the case? I will need a cane along and worry
it will be an issue. It seems awkward to hold one and drive. (First time user)
I stick my cane on the back of my scooter. I don't have a cane holder; I hang my backpack behind the seat and then slip the cane between the backpack and the back of the seat. It's secure enough that it won't come off without removing the backpack, and it sticks out upwards not outwards.
Something as small as a cane holder shouldn't prove to be an issue. As long as it isn't sticking out past the end of the scooter itself.
If someone did have issues it may just have been a cranky driver. I've had one or two drivers over my decade+ using the busses who were just unhappy no matter what I did. I can't bend my knees far enough to clear the steering column on the inside, which means when I sit on my scooter, both my feet are hanging out on one side, as opposed to one foot on each side. The only way to do one foot on each side is to sit down and then lift my leg all the way up and bring it over the basket and the steering column. I can manage it when I need to because I have decent mobility in my hips, but it's super awkward, painful, and definitely cannot be done while on a bus. Also, it flashes my panties to all and sundry. This hasn't prevented a couple of drivers from DEMANDING that I don't have my feet on the same side. What exactly would you like me to do, chop them off?
I've also had drivers insist that I take my messenger bag out from under the seat and keep it in my lap -- even though it was designed to fit under the seat, even though I cannot safely drive the scooter with a bag in my lap, even though other drivers have specifically told me I can't have a bag in my lap because it's not safe (they're right) and to put it under the seat.
99% of Disney bus drivers are wonderful people. They have regulations to follow, understandably. The scooter needs to fit within a certain space and you can't have a rear basket sticking out too far or a cane held horizontally. Most of the time if they ask you do to something it's for your safety and the safety of the other passengers.
But every now and then you meet one who will insist you do it their way even when you're not physically capable of doing whatever non-regulation unnecessary thing they want you to do.