even pedaling speed != even force.
As far as maintaining traction goes it's better to apply a steady gentle force via brakes then an uneven one via pedals in my experience. I have not done it fixed but I have plenty of experience mtbing in the snow... I have not lived most of my life in ga.

Maybe I will try it some day but I people claim that it's better in other poor traction situations too and with the exception of ****ty brake failure that doesn't seem to be the case either.