1. I have had the same issue/complaint. Mainly because I've seen families with a child with a disability and having no problem waiting in line but then you'll get someone who just has a broken leg or something and they decide they have the right to go in front of everyone (this is in reference to a specific incident, and to say the least the people in line were pretty vocal towards those who decided to skip but they didn't care [also note, while this was happening we all offered to let the family in line go to the front but they still waited in line]). Sadly, there are a lot of rude people out there.
2. I think it would be better to have more normal buses, as they can hold more than the kneeling buses for wheelchairs (and they are a better ride, as the kneeling buses sway more).
3. I think it would help, or at least a notice of how many buses are running at that time for each location.
4. I never had this be much of a problem either way, and it looks better at a resort without one IMO.