Treat adults as adults. Address people by their first names only when extending the same familiarity to all others. Leaning on or hanging on to a person's wheelchair is similar to leaning on hanging on to a person and is generally considered annoying. The chair is part of the personal body space of the person who uses it. Some AA members use powered wheelchairs not electric chairs.
Electric chairs are what some of our states use to execute people.
We have found that some AA groups use the H-handicapped for everything. It is very important to clearly post how the meeting is accessible and use the appropriate meeting codes. There is no one meeting code for all access needs.