I didn't even make these up, I'm just stealing ideas from like 10000 different games.
For Units/Clans/Guilds
- Sort the member list page by any of the column headers
- Export the member list page to a .csv or .xlsx or something...anything...
- Toggle button/checkbox to see only players currently online.
- When in a group, give an option to the group leader to promote a new leader if he/she doesn't want to be leader anymore.