I haven't seen this anywhere but it would be cool to be able to create and manage an outliner within nodebb topics.
I've submitted a suggestion with moo.do for nodebb integration. They're at least considering the idea. Not sure how much would go into a project like this. Hope it gains traction!
@stephanekassis just want to clarify some things. Are you just looking for stylistic changes?
Are you looking for the chat window to be "docked" to the bottom of the screen?
What kind of changes are you looking for?
Ex. A user puts his link/content in [hide][/hide] no one will be able to see the hidden content unless replied or gets rep. If anyone can make this email me @ email@example.com and will can discuss more at it.