Add new capabilities

While checking the code today I saw that during the physical world creation is not possible to specify the various internal parts (like the collision detection algortim dispatcher, the broad phase, the solver and so on) that the engine will use to perform its operation.

In bullet physics engine you have to initialize each part of the engine during the world creation.
For example this allow to inject an extended version of the default solver with particular capabilities that are not needed by a general purpose physics engine.

If this is not possible to do in nphysics right now, do you think that you will be ever interested in exposing all part of the engine to allow this kind of extensions?