As a JV official that just passed my Varsity Certification last night, I am having a hard time with this. I have asked a bunch of different referees and have yet to get a solid answer. Everyone's interpretation is his own.
Personally, I would T the player as bench personnel and therefore indirectly get the coach. If nothing else, he's wearing a seatbelt the rest of the night and that's not a bad thing in and of itself. Plus, IMHO, he deserves it for having a lack of control over what's going on with his team during his game.
The definition of Bench personnel includes the disclaimer "is not limited to" which to me spreads a large blanket to cover anything unusual. If the V kid is warrming up with the JV, he is at minimum, part of bench personnel as far as I can see.
However, the rules interpreter saying to add him into the JV book and wack the coach again, seems heavy handed. Even if a coach is the victim.
