It'd be nice to get notification sounds for when a friend invites you, when a votekick is started, etc. And from other posts i've seen, a notification for when a friend comes online, saying who it is with a sound (adding on to this post) These sounds could also be disabled in the menu. It is kinda annoying when in desktop mode you request an invite but you are working on other stuff and you keep having to alt tab to see if you get an invite, hearing a little sound to know you were invited would be nice. I am guessing there could be other use cases for this as well :)