Thanks for the research, we should add that to the Wiki.

Unfortunately there's no way to change the default previous season when viewing career stats so it'll always be 2004/2005, but you can change the stats for the 2004/2005 season for everyone by editing career.dbf (entries for 2004/2005 utilise 2004 in the year column). In other words, you can update the previous year's stats so that they are current, but you'll have to overwrite the 2004/2005 stats to do so.