There's not that many menu items just look at them all and see what's there.
It depends on what kind of changes you are making to the model. I assumed you were changing names or something like that. All the files are text files so could script that in Python. If you're not changing the model names then Batch Render will re-render everything for you. To be clear that doesn't "re-save" the sequence files it saves the FSEQ output files that contain the actual rendered data.