have you found this rotating doorstop?
I wonder if this doorstop is available in North America? I used it in Spain and brought back a few, but am looking for more. It works great--stops and holds a door--and pretty much disappears. The large half sphere has an adhesive backing and it goes on the floor between the door and wall. The arm with the small half sphere swivels...you move it with your foot to hold or release the door.
Here is a link that might be useful: doorstop