Here is an easy mod. Various people get pool noodles for cushioning/protecting slide edges, doors, etc. I really didn't want a bright red, green or blue pool noodle for this purpose so I stopped at The Home Depot and picked up some pipe insulating foam which is dark grey, cut a section about 2ft long, and slit down the length so I could slide it over the awning arm:
Now when the door flies open it hits the foam instead of the awning arm (sorry about the contrast it is a rather bright day today).