Capt, it's not implemented in core. It can be certainly done as a hack to groups plugin (hack is not a nice solution, as you will have to repeat it afetr every upgrade of Elgg) - you would have to modify /forms/groups/edit.php. With a few tricks it could be done as a new plugin which extends access handlers as well, although it would be a bit more complicated.
I am also trying to figure this out. Could you please help me, Mike?
The only thing I can think of is editing /forms/groups/edit.php so that the access_id is defaulted to a certain value. But that will set the value for all groups. I want to set the discussions for each group to only be seen within their own groups.
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