IMO inserting Riley into the lineup allowed Doman to open up the play book with the versatility he brought as a passer, runner and play maker. Additionally because Riley is very intelligent, and generally remains calm under fire - intense pressure, Doman can run more complicated play sets/schemes. He knows that Riley will move around the pocket in order for a play to develop, someone to get open, or take off like a bat out of hades to gain yardage. This gives him more options.
The biggest bonus for Doman having Riley at QB, is that several times he has made something happen when the play had broken down. Now if Riley can consistently use good judgment on when to take a sack, throw it away, or try a higher percentage pass, we will have something very special on our hands.
I believe that Riley has shown the coaches (Doman, Dupaix and Cahoun) that a mobile, dual threat QB is our future. Lark, Hill, Magnum, Olsen all fit the criteria of what Doman is seeking in a QB.
After seeing how Doman - Riley took apart HI in second half, I expect all stops to be pulled out (throw the play book at Tulsa).
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