Roof color options for the inside

I feel we should be able to color the underside of roofs. We got ceilings now, and some swatches do have the underside colored (though mirroring the outside color/design)

It would be nice to be able to color the underside of roofs like ceilings, especially if we want to do small lofts inside houses. The boring grey/white color just messes up the whole aesthetic if you want to have slanted ceilings (due to roofs)