Now, I may be wrong here as its been a while since I done the theory, VMD gives the best glide as well as the best ROC, so would I be correct in saying, if you went into the FMC climb page and got the speed for best rate, wouldn't this also be your best glide speed?
Vmd would give you the best ANGLE of climb as opposed to best ROC. Best glide speed on a jet would equate to Vmd=green dot=clean maneuvering speed. Best ROC speed is typically around 20 knots higher than Vmd/max angle.