Rotating stair case / transporter / smaller stair case

If only they would give us back the interior platform we had in Sims2. Stairs could be affixed to it, and presto! we could create the L-Shape staircase. I was grossly disappointed when we didn't get that back in Sims3, and now, unless it's in the works set for a later time, it looks as if I'll continue to be grossly disappointed. I had to make changes to the floorplan of my Grand Uncle's historic home, as a result! Not happily. Not happily, at all.