TbyteP,
You can use Wolfie's TweekSH3 to change the default settings. I have the file posted here:
http://hosted.filefront.com/bobchase
You would set "Enemy Detected" to 1, "Air Enemy Detected" to 1, and "Radio Report" to whatever maximum TCx you want to drop down to. A setting of 4096 would never change your speed for a radio message, while an 8 setting would drop you down to TCx8 if you were running around at x128
While you are playing, you might want to change your default map settings too. I found "Symbol Zoom" of 20 and a "Groups Zoom" of 100 works best for me on both maps.
There is also a mod to get the harbors' detail to show up in the attack map. But that one is only helpful if you are a harbor raider and you are OK with editing a text file.
Bob Chase