How to tag Ramp slopes in Revit 2013 and Revit 2014 with Slot Slope tool

In Revit 2013, you can't tag the slope of ramps in Plan views using the Spot Slope tool.  There are workarounds out there already, but here is an easy one:

1. Make a new Generic Model Adaptive family with 2 Placement Points
2. Make a spline between these two points (select them and then hit the spline by points button).  Set its category to Invisible
3. Load this Family into a Project, and using a 3D view, place it at the centre line of a ramp (the two points should snap to the correct location in 3D)
4. In a Plan view, use the standard Spot Slope tool in Revit - just pick the adaptive component "line" that you just placed.

EDIT 
As I mentioned above, there are other workarounds for this. One is to put a slope arrow on an adjacent Floor, then copy it on top of a Ramp. It works!

Check out comments and video link below...

Link:
http://www.youtube.com/watch?feature=player_detailpage&v=IJD14dDUKbU#t=71s

I actually found this did not work too well in Revit 2013 (no problem in 2012).  However, after a bit of fiddling, I have created 3 files (one for Revit 2012, 2013 and 2014) - all of which have spot slopes on Ramps that can be copied around.  Here is the link:
View / download