Well Pit Bull.......
If there is an operational reason (guess you HAVE to follow the manual) for not selecting standby I guess it's a balance thing, and for ATC it is not really a huge thing. We get far more nuisance 75/76/77 from merging tracks symbols (different levels... usually) than from switching codes.
Other than the circumstance I mention above, losing the radar track for a bit is no problem with EUROCATS 2000, coz the data-block keeps flying across the screen as directed by the flightplan + what the system remembers from your radar progress. Best bit about the silly machine.