False.
Section 3, article 3: SPEAKERS IN HELMETS
The Coach-to-Player system allows a member of the coaching staff in the bench area or the coaches’ booth to communicate to a designated offensive or defensive player with a speaker in his helmet. The communication begins once a game official has signaled a down to be over and is cut off when the play clock reaches 15 seconds or the ball is snapped, whichever occurs first.
Tmux with a few custom key bindings is amazing. Kind of a learning curve, but not nearly as bad as something like Vim.