Group chats in different section.
While I love having my sidebar divided in categories, how about something that divides individual chats and group chats?
It will definately help things being less prone to getting flushed down and conversations missed if those would be divided.
It's not a big feature, but honestly it would already help a lot.
Not just that, how about being able to pin something to the top or into a special category of it's own? I like to easily find back my chats without having to remember 1001 weird usernames in order to find it back, personally.
Two categories, with message bullets, dropdown arrow, and divided into groups and individual direct messages.
I don't know about others, but for me it would make a world of a difference.
So, just an example here, I made a basic mock-up in photoshop.
(I hope it shows up)