Possible solutions to solve AFK messages on people that aren't AFK

Few solutions possible :

1) If the player is doing some movement (other than an animation) he should have the message pop up. That includes driving a car. The AFK should be read on the characters movement / looking around, not on the input that the player is doing for those.

2) Have the possibility of moving the message in the middle of the screen and / or changing the colors of it to bright red and yellow with a command so people can't miss it. When you're focused on something, you might not see a small message poping on the corner of a screen.

Benefits would be not being kicked mid race / mid scene / mid negociation.