Organic Groups managing group members of large group

Hi there,
I'm Using drupal 7 and Organic groups 7.1.5

have some groups with 500+ members
Anyone got ideas about how to manage members such as add / remove / change Group roles with such large groups.
At the moment I need to go to tab Group / People
then trawl through all the pages slowly until i can find the member, which can take some time especially if their name is not near the start or end of the alphabet

1) Is it possible to create a user search inside groups with results that are group role editable

2) Is it possible to list certain roles (like group admins) to then change or remove that role etc? Sounds like a job for views but can i edit the group role of results?

would appreciate any guidance on this