Now go to what the manufacurer says about reverse thrust usage...read all.
I have 'read all' thanks very much. The FCTM states the following:
Full reverse thrust should be used when stopping distance is limited or when runway conditions significantly affect braking action. Idle reverse thrust may be used when conditions permit.
The FCTM makes lots of other statements regarding brake temperature, brake life, etc, some of which are contradictory. However, nowhere does it recommend the technique you described.