Are you talking takeoff or landing...V2, or Vref?
When we land, we use a bug speed which is not Vref. We don't bug Vref. We land flaps 25 rather than flaps 30, due to Stage III noise restrictions (747...not 737, but still boeing). We base all our other airspeed bugs of the bottom bug. With the bottom bug set at Vref+5, we then have bugs set at bug+20, bug+40, bug+60, and bug+80...and we maintain 10 knots above those speeds until established on final. (We have a 15 degree bank limitation on speed, but can bank up to 30 degrees with the 10 knot increase).
I'm familiar with the double bug recommendation...but it doesn't make anything less accurate. If you really want to split a knot and fly that precisely, then use one of the little white pointers or the other, or fly the space between them, for that matter. Considering the airspeed indicator may have an error up to 4-6 knots, depending, then it's really not compromising the ability to fly a safe, and accurate approach by double-bugging.