As an ATCO working in the LTMA, I would not want the Altimeter subscale setting on my radar - enough clutter as it is. What we have is useful. We don't need anymore! It doesn't happen that often, and spotting these things is one of the many things an ATCO gets highly trained and well paid to do.
Selected frequency, again is not needed and would clutter up the screens too much.
Mode S is a safety enhancement tool, not a replacement for good ATC practices.
Don't Hang Up
Slightly disturbed by this.
Surely controllers have been trained that Selected Altitude is ONLY used to confirm a vertical clearance has been received and correctly understood.
That's not how Mode S is used. The SFL is used to check that a pilot selects the FL you have instructed him/her. It is a confidence check. ATCOs still monitor a/c on radar!!
All Mode S does (and does it very well) is add another safety level, and in the case of SFL, helps prevent
some of the level busts we previously had by confirming the SFL correlates with the instructed level.
ATCOs still prevent level busts caused by pilots manually flying the aircraft and going to the wrong level or by busting a level due to incorrecty QNH. With Mode S, we now prevent some level bust from happening before they even get near to it!