Improve Stream membership limitation
Sort or listing names in alphabetically order
since you know there is a limitation with sorting or listing members in Stream, why don't you test the ability to highlight name list and then use the find feature in edit? I have over 100 students and trying to scroll through the list is ridiculous.
SECOND, I'm not sure how you envisioned the tool with more than 10 users, but there should be a feature when adding a member that you can indicate the group or community they belong to. There should also be the ability to sort those individuals separately. Check Google for this suggestion.