In construct 2 we have access to box 2d physics. Within this realm we can either chose to have a body that is dynamic (reacts to collisions) or static (doesn't move). There is a third type of body available in box2d that I need and perhaps you do to: The kinematic body. This is a hybrid body that can have a linear velocity but that is unaffected by forces acting on it. In other words, it can move but cannot be moved by other objects. Ever wanted to have a moving platform using physics but gave up because every time the player jumps on it it gets thrown off course? A kinematic body would work well here, but all that you can have in construct 2 is dynamic or static. Not every object that moves needs to be moved by other objects. Check out the link below for a short sequence of code demonstrating its uses and a short explanation.
http://www.emanueleferonato.com/2012/05 ... ic-bodies/
and while i'm on the topic of box 2d, is it possible to have chain shapes in construct? Wherever there are internal edges, dynamic bodies trip up on them, chains would solve this! or even ghost vertices.