Latest Revit 2016 have many improvement including Rebar Constraints Manager. In this news release you will be able to notice improvement in options like interactivity with a view, graphical selection, constraints to sloped faces and offset to covers.
The position of element was fixed in Rebar Constraints Manager in previous version of Revit and you were unable to zoom in dialogue area. Now in the latest edition, you will notice, after accessing the edit constraints dialogue you can zoom to scale which is most useful to see the drawing precisely. Find out more about the update in this video – Watch.