Chris,
I admittedly use walls for things they are not intended for.
I draw shop drawings of stairs and rails and use walls for the railing parts (posts, rails, pickets, etc.). when a pipe rail ends, it is nice to use the round cap to show that it is returning directly behind the rail. For example when a wall rail returns to the wall at the end of the run.
Walls are nice to use for this purpose as the joining properties clean up the joints without a lot of trimming on my part.