The Callsign history tool (Tools - Callsign History) is a very useful feature, I find and probably others do too.
I often look up the station I am connected to, just to recall whether we connected before and when and on what band.
It would be great if there was an option to add a comment on a certain station. Like, today I met someone on VarAC 20m and we found we have a common professional history in the field for high-power broadcasting. I would like to note that in a comment in the chat history.
I tried entering his name but this is apparently not permitted.
A user-definable comment would add value to the already very useful chat history option.