A: It would take extraordinary circumstances for what you describe to be a technical foul. If the players are sitting on the bench and shouting "Defence - Defence", it would be acceptable. It is difficult to provide a definitive answer to your question because there could be circumstances where the official feels it falls within the below where a technical foul can be assessed to the coach:
36.3.2. A technical foul by team bench personnel is a foul for disrespectfully communicating with or touching the officials, the commissioner, the table officials or the opponents, or an infraction of a procedural or an administrative nature.