This is what I love about design, it fixes problems you didn't realize you had until something comes along that makes you say, "Well, yea... why wasn't it done that way before?" The one thing I would say about this is the handle needs some sort of tactile feedback to let the user know the stop has popped out. It lets the user know how to retract the stop, but it needs to be tactile as well. Other than that, love it.
Right Angle: Foot-Free, Hand-Deployed Doorstop Invention | Designs & Ideas on Dornob.