current rate is 0-.25% why not allow for flexibility to move the rate.. 10bps if the rate was moved to 0-.125%, could provide some juice for the longs here a tightening to .35% would not be so harsh relative to .50%, correct? i am thinking in terms of elasticity and percent change.
They don't need another mechanism to achieve flexibility, as they already have the FF effective that can deviate from FF target that moves in 25bps increments.