What have you NOT seen on other cycling shoes that you would want on your shoes? A snap-on cover? Why would you want anything that snaps on when the hook and loop seems a much better idea (may attract dirt and really ugly) then there are the slip-on covers. What would make your shoe stand out against the market? Snap-on covers will not be IT.

Why would you want it to fold to the side? Picture that in your head! Extra stuff flapping around on the side when the snaps fail. Where on the shoe are you going to add more stuff for attachments and why?