Yeah.. I can understand that balancing act needed between simplicity of the process in setting up groups, and some of the tools needed make those groups functional. Frankly, if re-doing goals where there was no contribution was implemented, I think it would go a long way to making the current implementation less frustrating. Being able to re-do goals for NO credit and for NO additional badges, but to help out friends who start goals later would be cool too, if implementing advanced song tracking is too complex.
Look forward to the near future's announcement.