I think that VolvoGirl might be concerned that increasing the amount distributed would generally increase your taxable income, so you would have to factor that in when determining the amount that you choose to have distributed and withheld for taxes. However, if your distribution is larger than your RMD, even though you allocate all of the distribution to tax withholding you could still substitute other funds to perform a rollover of the amount in excess of the RMD (provided that the rollover would not be in violation of the limitation that you are permitted to roll over one distribution in a 12-month period).
