On the one hand, automatically restarting at the beginning does make re-reading a little quicker. On the other hand, leaving it at the last page is a reminder that that archive was already completely viewed. I'm not sure that one is better than the other, so it would need a new option in the global config to choose which to do.
As far as automatically starting the next archive, that isn't hard to do if the files are only sorted alphabetically. If you wanted them to be sorted by series and volume number, that would be a lot more difficult (and thus prone to error). Maybe the best is to just show the user the next alphabetically sorted archive name and ask them if they want to start it. That behaviour would also need a global configuration option, since some may not want to be bothered with it.
I'll look into it this weekend, but may not get it done, since there is plenty of hockey and the Super Bowl on TV.