Is it likely that you add a function to save a mesh from within the engine as an mdl?

I'm giving workshops about game making for kids, and get more and more younger children who are hardly able to get satisfying results within MED.
So I worked on an editor that allows to modify existing models in game by vec_to_vertex. I save them by a code contributed by ventilator, http://www.opserver.de/ubb7/ubbthreads.p...true#Post185155, but it saves only in the format .obj.
First the models with the format .obj don't load reliable, means sometimes they load, sometimes they don't.
Second the format doesn't store animations or bones, but I would like to let the children modify animated characters as well.

Thank you for your time.