Box2D extension improvements

  1. Ability to visually connect object with joints in scene editor.

This would make making things like physics bridges or ropes made out of segments easier. All types of joints supported by b2D should be supported by this feature and you should be able to connect joint to any control point on the object.

Could work similar to feature in Phun/Algodoo of same effect.

  1. Setting up “collisions groups”/making settable with which objects/groups box2D object would collide with.

This would be useful when you want some objects to collide physically which each other, but also want some other objects that have physics enabled to not collide with those objects and collide with other instead.