As Capricious says, the ballhandling duties will go to Pierce/Daniels, and then, in a smaller rate, to those three guys, who will share minutes depending on matchups or the flow of the game.
I like how Doc is shaping rotations, putting the pressure on the perimeter D. I can see that until Playoff time, where he'll probably play Rondo (who will be healthy and rested) almost 48 minutes a game. The rare minutes when Rondo isn't on the court I can see Quisy being the first backup point guard, with Dooling playing the 2 and Pietrus the 3, in a 9/10 player rotation (depending on JO's status):
Rondo/Quisy
Ray/Dooling/
Captain/Pietrus
KG/Bass
JO/Wilcox
Looking forward, Bradley could end being the backup PG, with all the confidence he's getting. I see Moore as an off-guard and scoring machine. While his BBIQ and maturity makes him look as a pretty good prospect at PG, if he keeps improving his shoot and defense he could even start at the 2, a role for which he's better suited (just my opinion).