Phil,
I don't think a man being a Gentleman is a turn off, but I do think a lot of younger women today don't know how to respond to that sort of treatment.
The best way to get a date, in my opinion, is to find someone you want to go out with and the two of you go do something you both enjoy. Just having activity time with others is a good way to warm up for more specific dating. The older we get, the more specific likes and dislikes we tend to have, and if you are comfortable expressing yourself, it makes the whole thing easier.
You will most likely have to educate people you meet about your disability and your chair. I do sex education work and one of the women at our group is in a chair and led the disability teaching session. She talked about how she really had to let guys she was interested in know how mobile she was or wasn't, and how much care she might need if they went out on a date. No one felt imposed upon suddenly and they were able to set activities where they both could participate.
There are some interesting things online too:
http://www.adaptivedancing.com/ - Rae
