Nice feature.
I use firefox on linux/X11. So I often paste the URL with the middle mouse button. But not into the address bar. It's long-winded for what I realy have in mind: clear-adress+paste+go. I normaly paste the url with the middle button into the website-window itself. So I don't need to clear the address in the addressbar and the browser also jumps directly to the address. One feature chrome is missing entirely.
It's funny that your feature with missing "h" or "ht" in url-schemes works clearly in the addressbar of firefox29, but not when pasting the url into the website-window.