Some times on the working process we need to add photos in order to have a better model, or in order to replace bad ones. in a case that we already create a model we need to recreate all the model again.
It could be nice and time saving if we could recreate the AT and then the model using only the delta of the photos we add and not to run again the AT and Model based on all the data (or maybe only the Model, could be easier).