Jan-
I disagree with your statement that the workaround is "efficient". How much time is lost each time you:
1. Have to leave Revit to Ctrl-C copy an ID
2. Have to Open "Select element By ID" and Ctrl-V paste then click Show
3. Close the Select By ID box
4. generate th cropped 3d view
5. Then rinse and repeat???
In the time you do one warning round of that, you could have made it through 3-4 warnings without ever leaving the warnings dialog box = more efficient. I don't disagree that the workaround works for a few warnings, but when dealing with many,many element ids, the workaround is not good. I run into very similar problems when using Copy/Monitor. it is near impossible sometimes to see what the element being highlighted is without leaving the Coordination Review dialog altogether.