I agree, though Firefox's awesomebar (if it's still called that) already integrates search, and seems to autocomplete to things I've never visited with suggested search queries. This might be related to my use of the DuckDuckGo extension though.
I also use ctrl-L and ctrl-K for navigating and searching, respectively, and I've found the way Chrome handles ctrl-K by focusing on the navigation bar and filling it with a '?' lacking. For instance, it clears my last query, where I often refine queries after quickly inspecting the results I got first time around. The requirement of having a '?' in front of search queries is also annoying, since it hinders a lot of keyboard shortcuts. Most notably, if I change my mind, Ctrl-A doesn't allow me to restart typing a query without manually inserting the '?' again.