The only thing i could see rerolling for would be SiW or TB during CDs. But guaranteed 2 roll buffs would fix a lot of the inconsistency we have. You can't argue that wouldn't fix the ridiculous damage spread we have. Spending 20-40 combo points on what could otherwise be Run Through is not good gameplay.
I wouldn't reroll if i had any 2 buffs. If i had broadsides and jolly roger during CDS, MAYBE. But even then probably not.