You should probably switch the PA over from a RB to a Community Group - you can create a link on the resource boards to the community group (so current users can easily find it), and you can make any member(s) of the PA group leaders who can manage/edit the group's bulletin board and topics. They'll have much more control (community groups are similar to a teacher's class bulletin board, without the grading or assignments :-)
You should probably switch the PA over from a RB to a Community Group - you can create a link on the resource boards to the community group (so current users can easily find it), and you can make any member(s) of the PA group leaders who can manage/edit the group's bulletin board and topics. They'll have much more control (community groups are similar to a teacher's class bulletin board, without the grading or assignments :-)