Yes to the modulator, with an on/off switch (of some sort).

As for Jason and Damian...

Damian is a great character, but its always seemed to be Jason reaching out to team up with him, only to have Damian betray him (somehow) later on. But it seems with Damian's betrayal at the bar, and later on in Leviathan (even with how badly he was written in it), and Bruce not really questioning Damian the second (and beating Jason up in RHATO), Jason isn't coming back into that fold anytime soon. I can seem him working with Kate (again), Tim, Duke, and maybe Dick if he ever turns back to normal. But the Waynes...