Hi,
First of all, do you always trust one source of information, or do you try to check and confirm it with another source? Secondly, if we have a choice of two callbooks, the logical consequence seems to be to show which callbook the information comes from. Thirdly, IMHO, showing this information is much more important than, for example, displaying DX flags which have no any meaning from the operator's point of view and are only an aesthetic addition. And last but not least, if it is a big problem, I can live without it, of course.
How it can be displayed?
Very easy, just short text like 'from QRZ' or 'from HamQTH' somewhere in the New QSO area of main window, it is a lot of space there. BTW, similar feature is used in Log4OM.
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73,
Slav, EI6KW / SP3RXO
Slav, EI6KW