You can already look in the roster to identify if someone is in the arena. Then ask on ch200, then green text, and finally PM a friend in the other country to locate where he is operating. Or you can ask on country text if anyone is facing the given player's squad at the moment and work from there.
Over the years squads have decided a single player or the players squad was in need of attention. Never took them long to locate the theater of operation to move to. The current hover over a friendly dot for a name, enabled or disabled by HTC is meaningless. Cross country communication has always influenced finding things in other countries in some manner or another. This is a game, not NATO.