When one or more MassFX constraint helpers are selected in the scene, you can edit all of their properties simultaneously using the rollouts on the Multi-Object Editor panel.
Interface
The Multi-Object Editor panel rollouts for constraint settings are mostly identical to the equivalent rollouts on the Modify panel, with one exception:
There is no Connection group on the Multi-Object Editor panel 
General rollout, because each constraint is typically connected to different rigid bodies. Thus the Parent and Child settings found in the Connection group are usually set on an per-constraint basis on the Modify panel.
General rollout
The General rollout on the Multi-Object Editor panel provides settings for controlling constraint behavior, but not for setting connections for the reason explained preceding. See General rollout.
Translation Limits rollout
Swing & Twist Limits rollout
Spring rollout
See Spring rollout.
Advanced rollout
See Advanced rollout.