Is there a way I can easily add custom fields to my Groups? There is additional information I would like to capture when creating / registering a new group (I guess it doesn't necessarily need to be captured at registration, but would like to have additional information specific to that group stored -- ie. budget, additional text fields, dates, etc). This information would also change throughout the life-cycle of the group and would need to be displayed to group members.

Is there a way to do this without modifying a significant amount of source code? If not, what files would I need to look at changing and what would be the best practice in doing so?