Absolutely agree with this.
For the sake of gameplay "reality", there is no reason that we should be able to tell who is a player and who is AI from the radar alone.
It might be an idea though if we can somehow "mark" a player as known, so that they are identified next time we see them.
I like this idea.
So CMDRS invisible unless you do a scan. when you are doing a scan, or being scanned the scanning ship pings on the radar of the person being scanned
once you have done a scan like you said it would be nice to have the option to "save" their transponder ID with an option to add a threat level incase you come across them in future (friendly, hostile, neutral.
This is basically what many of us will be doing with pen and paper, but its cleaner to do it ingame AND it makes sense imo from a believable point of view.