It already has by me. But I found something interesting. The altitudes, even in white, can be selected and designated. HOWEVER, this will not work when you are in the "Approach" section of the FMC. Your cursor should have no problem designating altitudes. But when you use either the Approach or Arrival section....well then the cursor skips them.
I mentioned in another post how inconvenient this is because you need to designate those altitudes if you want to use ILS. Since practicing landing in bad conditions is what I'm trying to achieve, this is really frustrating.