Oldmanwheeler, I a new to Chief Architect and also have accessibility concerns so a ADA accessible download to Chief's library was one of the first things I looked for they do have a free download for the library unfortunately it is very limited and appears to be greatly lacking. they only have extremely general items like signs, door handle, toilet NOTHING I saw for parking area, walkway widths, ramp grade, mobility stair or pool lifts just to name a few.
You probably know as well as I do that other people that don't have a disability often just forget about us. I did use the Contact US to email CA about this but haven;t received a response. The best and only option I have come up with is contacting ADA to get a hard copy of the federal ADA guide lines of accessibility, and then manual create and save each single item for your Chief Architect library. I am not a professional so I only plan on doing items that meet my specific disability requirements so they can be designed into my home.
good luck hope that helps