Let me get his straight... you do not know who your wingman is?
a player would be interested to know who is interested in a players location and using the wingman command to find this out would be a simple script to make a text announcment to whoever is being wingmaned just like the one given to the player typing the wingman command would it not?
How about adding a "do you accept this player as your wingman?" prompt to prevent stalkers? Kind of like join requests. If you check "no", then he can't highlight you on the map.
I remember when Shane requested to actively highlight his dot on enemy radar and to let even the enemy wingman him so he could advertise his location in a 'come get me' style. But then Shane was a badass