I suggest the addition of group signals or beacons. This alow members of a group to create a beacon on their individual ships. The beacon changes the player's radar icon so that it is blinking. This beacon can only be seen by on the radar of members of that player's group. The beacon would serve a multitude of uses.

1. Can be used to signal members of a group for help

2. Can be used as a homing signal to lead grouped ships to a spacific area of a sector without confusing radar signals.

3. Can be used as an attack or retreat signal.

I'm sure there would be many other applications for the beacon.

Quick note, group members in the same sector always appear on each others radar and can be targetted, regardless of the distance between them. But to target group members more than 3000m from you, you need to bring up the sector list ('u' key by default) & click on their name (the name will be dim, as if they're too far to target, but clicking on it will work).

Various types of signal beacons are among the most common suggestions. I would be surprised if some type of beacon isn't eventually implemented (soon^tm).