Sockets on Control Rig?

Is there a way to put sockets in a Control Rig?

I ask because sometimes the new “Parent Constraint” seems to uncouple its constraint link; the object appears to loose its constraint in the level however Sequencer still shows the constraint active. I am not animating the constraint “on” or “off” in sequencer, so I do not think it is an animation issue.

In 5.1, I have to delete the old parent constraint and make a new parent constraint.

“Attach Tracks” in Sequencer will allow you to use/animate sockets on Control Rig.