A comment in my previous post asked about stringers that are exposed. Since I took the easy way out and said that most of these stairs are tucked away inside walls it is only natural that someone would like to do it the hard way!
In my reply to the comment I mentioned a few options that come to mind: In-Place Family, Walls and Edit Wall Profile, Railing with custom profiles or just accept the way the boundary/stringers are created by Revit (yeah I know that last one isn't very tasty). Here's an image of the result for the stair using an In-Place family. It's late and I was lazy so I only did one side, that and the other side is still buried in a wall, that's my story anyway.
VIDEO that shows what I did. You can listen and watch here instead.
Another approach might be to build it as a component family. Use the basic stair tool to provide the typical representation of the stair but build a more exacting version in the family editor. This version can be placed so that 3D views benefit from it and sections will show a more accurate representation of the stair. Naturally you'd work your way toward this, no need to do it in schematic design but later when you are ready to really design the stair it might make sense?
[Edit - added images]
James Savage shared a couple screen captures with me for his approach to these stairs. It is similar to the approach the Jeff used in his video, adjusting where the boundary lines start and stop...moving them forward or back along the stair path. This gets pretty close. For complete control the in-place family will still offer more options. At least James worried about supporting the other side of the stair! Thanks for sharing them with me.