It would be really helpful if path animation would also work in the game engine. eg. you animate the object along a path and get this to show up in the game engine by using an IPO actuator.

I propose a button that is ON by default under or near the buttons for actor,ghost,rigid body etc, but it can be turned OFF -->so that the view doesn't become so cluttered when you have Physics Visualisation turned on in the game menu.

Then you can see how the physics are being calculated on the selected objects only. It gets impossible to see after you have more than 5 objects on top of each other.

Not sure how hard it would be to implement.