These were sent to me by my friend and ex-work mate Ramón López and programmed by Pilar Molina during the production of the shortfilm Shift.
One of the scripts adds Arnold subdivision to all the objects in the scene and the other one adds the same property but only to the selected objects. Finally there is another handy script that substitutes all your textures in the scene by the equivalent .tx textures.
Download them here or here.
Thanks Pilar and Ramón.