I have set up one sensor to detect players (friendly, neutral and owner). My avatar is detected but when I remotely control a ship it disappears from radar / is not detected by the sensor anymore though still floating in space at the same position.
Don't know if this comes from the filter you're applying or if this is a "bug" of SE.

Probably the way I'm detecting characters. I used a bit of code from one of Keen's sample scripts for player detection. It looks for an entity (a ship or character/astronaut) under control by a player. Actually, I bet it would detect the ship under remote control as a character. Hmm... I'll need to test that and see if I can find a better way. Thank you for reporting this. Despite using remote control all the time, I never thought of that scenario.

Midspace has reported a problem getting players from MyAPIGateway.Players in multiplayer when they are remotely controlling something. So I think as long as the player isn't roaming around with his avatar but controlling something else the avatar won't be reachable by the script.