How about when a port is taken the cv belonging to it appears on the map to the takers. Bish take Knight CV, Knight cv appears on Bish map and have the opportunity to sink it.
Not a good idea ... The tardlet use (or misuse) of CVs as described in this thread is not typical.
Many times I have been on and our port has been taken, and the use of the CV, that came from that port, was of vital use to regaining control of the port again.
The enemy knew that the incoming attack was coming from the CV but they didn't quite know where it was coming from and that was important to taking the port back before they could find and sink it ... your idea would eliminate the "stealth" of the attack and the "hunt" for the CV.
This has been mentioned before ...
CV command should be given to an individual who is either on the bridge of the CV or in a plane/vehicle that originated from that CV.
Once either of those conditions are not met ... CV command is up for grabs.