Nope not hard to do...but every catalog object, to have that feature, would have to have redefined texture domains. Not hard to do, but a lot of work for an intern.
Would be very handy for doors too....all doors in my houses are different inside vs. outside except for wood stained finishes. Especially valuable when doors shown partly open. Of course may need door edges as a texture choice as well because doors don't have textures split along an edge.
Could be implemented similar to walls with in and out sides and edges...with dialog box to choose same both/all sides or select texture for each side and edges.