For example if you have N groups, and you want them all to have some forums together. You could solve this, as phpBB3 works today in these ways:
- Make a super-group, and make all individuals in the groups members there as well. Problem, you have to remember to add the new member of group X to the super-group.
- Give all N groups permissions on the "super-group-forum".
Of course, the super group must have both groups and individuals as members.