Learn how easy it is to sync an existing GitHub or Google Code repo to a SourceForge project! See Demo
Is it possible to modify ipscountry.dat and specify my own values?
Have a look at the GEO subdir in the plugins dir. There you will find two tools ipc2txt.pl and txt2ipc.pl. They will help you to get ipscountry.dat customized. However, trying to use private IP block adresses (e.g. http://www.ripe.net/db/rfc1918.html) might give you some pains.