Your plugin is the the best so far in group hierarchy and many thanks for developing it.
But it would be better if you add this feature.
I would explain my case, My site is a sports website which need group categorization. something like this.
groups ---> football ---> football in state, football in town
In the above the first level of group categories( football, basketball, baseball) needs to be fixed.
When a user creates a groups it should be mandatory that he selects a main catogorization ( football,... ).
and the page football should not be displayed in groups list.because its actually not a group and just a category. (www.site.com/groups).
when we seek the url http://www.site.com/groupscategory/football it should display all the groups categorized under football.
I know that this feature conflicts a lot with your existing plugin.
but i have searched the entire web their is no plugin which matches this requirement which is mostly asked by many buddypress developers. you have developed a fabulous plugin i hope if you develop another plugin which categories the groups and display it that would be very effective and useful for many buddypress users like us.hope you do it.