Those are two very good suggestions.. I completely agree 
The ability to limit users to a single review per group is coming in the next version (the basics are already in https://github.com/boonebgorges/bp-group-reviews/commit/6d74553c17bb4c8392b4831e06e9b4f5d5dda675).
It’ll be pretty easy to hook the group reviews into the group directory display: https://github.com/boonebgorges/bp-group-reviews/issues/#issue/5
Sorting by group reviews is a whole other ball of wax. It can be done, but at the moment it involves reproducing the entire bp_has_groups() query class. Should be easier once BP 1.3 rolls out, at which point I will modify BPGR to take advantage.
That’s great news, I really look forward to it.
First of all, i like this plugin very much!
My only problem with it right now, is that it is a static rating. I’d like to see it over a time periode (say a month). At the end of the period it is set to zero again. Then you can compare those periods, so you could see changes over time.
Wow, that’s a really interesting idea.
Technically, it would be possible to do this now. Ratings are linked to activity items, and activity items are dated. So you could build a tool that gets activity items between a certain set of dates, and calculates ratings based on that. To make it more efficient, you could set it to run once per day (for instance) and cache the result until the next time it runs.
In a future version of the plugin, I plan to convert the ratings from activity data to custom post types, which will make this kind of filtering and calculation a bit simpler.
