Global NuGet Feed Credentials?

I'm trying to use a private MyGet.org feed during my build step and see that I can add credentials in TeamCity. This is outlined at: http://docs.myget.org/docs/how-to/consume-a-private-feed-in-teamcity

I have quite a few builds though and this would be tedius to set up for each and every build. Is there a way I can add feed credentials globally?