Replying to a conversation should open a 3rd window
Currently when you are in a channel you can either start a new conversation or reply to an existing one. This is confusing as it means the two reply boxes sit immediately above each other and users constantly start new conversations when they meant to reply.
Configure chanels to work more like message boards: the top level of the channel only shows conversation titles. All replies happen in a 3rd sub-menu where they are clearly differentiated from a new topic.