I would love to see a spline system for maps for creating hand drawn side scrollers with curvy landscapes. The splines would be set to immovable objects for smooth character movement... Currently I am overlapping Boxes to get a similar effect. That would help me soooo much. Construct Rocks!
Another option that would be cool is in the animation window.. to give an option to apply current bounding box to all animations... so it is not so hard trying to match them at the bottom where collision is needed. Not just the current animation but all other animations associated with an object. So just add one more option to apply to all animation sequences.