The “dupe” tag in the log is really handy for cleaning up a log after the activation.
There are two related ideas that I’d like to suggest:
Could the name/QTH pop-up be modified to let me know real-time the call sign is a dupe?
If I worked the op on another band or mode (which is not a dupe), could the pop-up include a note that I worked him or her before, something like “Again” or “QSO #__”? I worked someone on five different bands recently during a single activation. I remembered his call, but in case I hadn’t, this flag could let me know to say something like “good to hear you again today” or on CW, “GM AGN BOB.”