@Daran *********
, No, as Tod says, there is no "non O multiple entry" anywhere. You apply for a 1-year extension (fee: 1900 baht), AND a multiple re-entry permit (fee: 3800 baht for multiple). Those are separate things.
You will get a full 1-year extension stamp after a 30-day under-consideration period. You want to apply for a re-entry permit once you get a 1-year extension, and it will be issued on the spot at most immigration offices.