Here's a doooosey,
Is it possible to have two sprites with physics behaviors and bounding box collision pinned to each other. I did a simple test with two squares, added pin behavior and physics behaviors. Then did
System-On start of layout->Sprite1 Pin pin to Sprite2.
When I launch the preview, they both for a split second are together then bounce apart next to each other then fall at the same rate to the floor.
My mind is guessing to some how put in a condition where either the physics or the collision is disabled and then triggered on when needed but I could use a point in the correct direction on on just getting them to stick together lol.
I tried to check the Pin section of the manual but it was a little bare :)