Excellent. Just in time for Jukola and Jukola preparations.
I suggest considering a feature for users to configure own tile services to be added to the background map menu. Less need for you to configure similar local services, less maintenance work. And clubs or users could make tiles (with gdal2tiles for example) of their local O maps and host them themselves to get most used local O maps as a background option. For example we would get pretty nice bg map by using the data we already use here http://www.rastivarsat.fi/kartta/