I've just found the "Tile usage policy" of OSM. They request downloaders use HTTP Expiry Header or 1 week age per default. We have to change the value in Viking's code.
http://wiki.openstreetmap.org/wiki/Tile_usage_policy OK, so in order to be good OSM citizens change the units to days (I don't see why not) set the default value to 7 (days) (definitely) only allow 7 and up for a config (probably) people who want to reload things can use 'reload all onscreen tiles'
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