Hello LMG,
We'll consider the possibility of Smooth Model implementation in GUI. To apply smoothing to all the frames in the chunk you need to use list of integers (each one of them is the number of frame to be processed):
frame_list = list()
frame_list.extend(range(0, chunk.frame_count))
chunk.smoothModel(3, frame_list)
Actually, you can create a custom menu item by youself. If you wish we can assist you and post the complete code of the script that adds the smoothModel operation as menu item and allows to select if smoothing is to be applied to the single frame, all frames in the active chunk or entire workspace.