Barry Thornton's Edge of Darkness describes a process whereby you selenium tone first, then wash, then apply the Potassium Ferricyanice/Potassium Bromide bleach (and 3g/liter is still kind of strong, in my experience); then fix again, but you can redevelop and do it all over again as long as you wait to re-fix until you're satisfied. The selenium holds back the darker areas, and the highlights get a fuller bleaching.

As other have noted, you get some changes in color (more with some papers than others); and every re-bleach, re-fix, re-develop or re-whatever that you do seems to take its toll on the print, until after several rounds you end up with something that just looks really...tired.