Welcome to the forum, and thanks for your support of Samsung products.

Just Scan mode is not the best mode for all inputs. For some it will work, and for others, it could actually take away from the picture.

Our sets don't default to stretch mode, and I checked with our television specialist and he also noted that it's not something that is programmable within the television itself. I believe that some harmony remotes will allow you to program macros so that one button will perform up to 5 or 8 functions, so you might be able to train that macro in. Users have reported mixed results with mixed models, so I don't have a difinitive answer on the solution.

We're here to help, so if you have any further questions, just let us know.

--HDTech