GRRRR! I just finished one of these. set it up with corner tie outs for a mini-tarp/tarp extension. But I like the mitten hooks you show here, great idea.
I have used this style pack cover as a water bag, bear bag, pack cover, gear hammock (love this application), mini-tarp shelter, and to block wind in a shelter in the GSMNP. I am brainstorming on making one double as a tarp door. I have also thought about adding strapping to the inside so that I could hang my pack under it when on the bear line.
The good thing about those mitten hooks is they can be added as an after-the-fact add-on very easily. just pop a few stitches on the ends of your rolled hem and sew them in like they were meant to be there from the get go.