You didn't point out that you were talking about future capabilities - yes,
additional conditional formatting capability will be nice, but not of much use
now.

I think you'll find that the original questioner is aware that the
multi-colouring can only be done with VBA. I certainly am. That was why he
asked about the ability to get a [vba] function  called from a cell formula to
affect other cells. He's already half-way there, and I was supplying one way of
moving the next step.