To have objects that dangle be able to collide properly with other objects when they dangle. At the current time the object just appears to be dangling but actually stays in the same spot.
I am not sure if this is related to the separate request “Getting dangle and collision effects to work together”, but I was trying out magnets pulling out my hair for 2 hours. Finally I worked out that I think putting a dangle on the object disabled the Magnet. Removing the dangle made things work. I had a balloon on a string, so the dangle made the string flex. Without the dangle its more like a balloon on an inflexible stick.