Updated Federated Wiki Feeds today with support for lists and rivers for rosters and peers.
I already had support for peer subscription lists. These were generated from the list of wikis generated by the present plugin. About Present Plugin
Now you can view a river with only the wikis that are in the peer subscription list. For example: ward.dojo.fed.wiki/peers.html 
Additionally, I've added support for subscription lists and rivers generated from parsing rosters. About Roster Plugin
Here's an example river using the roster on dojo.fed.wiki/wiki-writing-workshop : Wiki Writing Workshop River