I'm sorry. I did post a reply to your thread on disABILITIES, but I didn't have time to make sure it registered right (I was at work ....shhhh) and when I checked just now, my reply wasn't there. Anyway...
There is a Guidebook for Guests with Disabilities for each park that can be obtained from Guest Services. They are not
real specific, but do list things like restrictions and a little bit about each ride like whether it is a quiet ride or a turbulent thrill ride. They don't address oxygen at all, probably because the thrill rides where it would be an issue have cautions about riding if you have heart, blood pressure or other issues that would make thrill rides too much. I have seen peole on quieter rides like Small World, the Carousel with oxygen.
You can try emailing Disney if you go to their official website at
www.disney.com I've had good success with getting answers to questions from them. Just make sure your subject includes something that indicates you have special needs rather than just a general question.
You could also try asking the oxygen suppliers.
Care Medical:
http://www.caremedicalequipment.com/
Colonial Medical
http://www.colonialmed.com/about_cms.html
are both medical suppliers in the Orlando area that carry oxygen. Chances are good that your local supplier already has a relationship with one of the Orlando companies.