Thanks for pointing these out! Your comment helped me realize that the description could explain this more clearly.
RenderRoster keeps an automatic job ID based on all four axes in each filename, even when camera or world names are omitted. Versioned filenames also preserve earlier renders.
Continue and Retry skip completed jobs within the same Blender session. Recovery after a Blender crash or restart isn’t currently available through the UI, so that part of your suggestion goes beyond the current functionality.
I’ve updated the description to clarify both points. Thanks for the useful feedback!