@pwFoo Auto complete has already been implemented in the latest version, it just hasn't been fully tested/prepared for 0.5.0 yet I thought about notifications for a bit but it would be too annoying, since mentions in a shoutbox would happen way more frequently than in a post.
About your second thing, do you mean in the tab/title bar? It should already do that (something like
username has shouted), but I also noticed it's a bit of a hit and miss, though I can't really do anything about that, since I'm using a built in NodeBB function to do that. (I love you core devs ;))