This should definitely be a new functionality for Revit.
Steel walkways and gangways are often modelled flat and need to be shown on different angles when linked into the site model.
At the moment I have to export my 3D model to AutoCAD and link that file in which is a terrible but necessary solution.
Thank you for visiting our forum!
I understand that this may not be the preferred workflow, so I am including the following link. It is setup for you to submit feature requests, or feedback, directly to our development team:
http://usa.autodesk.com/adsk/servlet/index?siteID=123112&id=1109794
I encourage you to use the feedback link as our Development group is always interested and would like to hear your feedback directly, since you are better suited to state the business case for a feature request.
Hope that helps.