Keep in mind the only thing GSX knows about the outside world, is the data in the AFCAD so, the best you could ever hope as a possible representation, is something similar to what you could see in ADE.
Yes, I agree that it might be a nice feature but, there's always the risk of users not accepting it, because "real pilots don't have it", something similar to XPOI, which is a very smart program, but not nearly as popular as GSX, for the only reason that it offered something (useful) you don't have in real life.