I really love the new parametric model feature in the model lab. it would be nice to have a feedback box there built-in. That way, users can suggest new parameters to be added to make the parametric models even better.
They need to add a full solution where designers can add their own code and anyone can create models from them and maybe earn some reward points. That would be awesome!
They have announced today that they will add a this feature to the model pages 
so in other word we will be able to publish openSCAD parametric design and user will be able to play with the different parameters:)