In almost all my Revit MEP classes, when building Schedules/Tags, often the desired Parameter value is sitting there staring us in the face, but we cannot access that data, such as: Elevation -and- the secondary elevation value: Offset. In my reading of other blogs out there, I ran across this article on RevitOpEd:
The Whitefeet folks (well...'fella' I should say, Mario Guttman) has provided for PUBLIC consumption some Revit utilities (I like to call these types of addins: Revit Express Tools) that you may find very useful. Particularly the Parameter Tools that will allow you to access and then assign those outta-reach parameter values to your designated parameter. It's pretty cool and mega-thanks to Whitefeet for developing and then giving them away.
This is just a heads-up post, you can learn how to download and use the utilities from the Whitefeet website.
Just the Whitefeet cat alone would win me over to Mario's utilities