Custom races are not fully implemented. The override field only makes your race name appear to be something different. There's no mechanic behind it yet. We might look into this feature.
Guys,
GenCon is coming fast. Most of you are getting ready and pack your PHB to experience the "best 4 days of gaming of the year". We'll send the new version to the heroforge master guru in a few hours. However those guys will attend GenCon as well and might be already in the plane to the US.
So we will release a version as direct link. Stay tuned and watch this thread in a few hours from now. After GenCon you will be able to download it again from
http://www.nzcomputers.net/heroforge/default4e.asp