I see what you mean and that's a good and interesting idea.
However, I think while it would be revealing in some areas, it would mask other problems.
For instance, if you look purely at the FTE, you wouldn't see that George had worked 60 hours. That's a problem. Why did George work 60 hours? Was he really productive for all of that time or is he gaming the overtime system by deliberately doing less work within normal hours so that he has to do overtime to complete his scheduled work.
However, I think while it would be revealing in some areas, it would mask other problems.
For instance, if you look purely at the FTE, you wouldn't see that George had worked 60 hours. That's a problem. Why did George work 60 hours? Was he really productive for all of that time or is he gaming the overtime system by deliberately doing less work within normal hours so that he has to do overtime to complete his scheduled work.