I see what he’s saying. I thought just having the year would work as well, but EE treats it as an entry ID not a year, and so displays no entries - at least in my case. Not quite a blank page, though, just blank where the content would be. So I would expect:
http://www.lisajill.net/dem/index/2007
to throw a year, but the content area is blank, because EE believes it to be an entry ID of 2007. Having the / month there changes the context enough that EE does it by month.
Did I get that right, Magnus?
As to your issue with the yearly archives - what is it doing that you don’t like? It would be far more beneficial to your request to be explicit in that. I personally don’t have that plugin installed so am not entirely sure how it outputs its information and, therefore, what you dislike about its behavior. Certainly you could put together a plugin for this functionality, though.