Hi TKFS,
Actually I am not 737 driver, but sometimes in IL-76 ( heavy cargo) , when landing speed is too high cos of landing weight and the plane 'doesnt want to land', especially at high altitude AP with short RW pilots open idle reverse few sec before touch in order to land at TDZ. Some of them even open 2 doors which have hydraulic drive and use them as an airbrakes during the landing run to save tyres and not to overheat brakes.
Regards,Maks