Distinct or Configurable Sounds for Notifications
Provide additional audio cues for people who for vision or cognitive reasons are unable to read the notifications that only appear on-screen for a fixed period. Ideally different sounds for different types of notification, allowing some to be understood without the need to go into the notifications log. This would also mean some added convenience for gamers in general, as there is less need to shift focus from gameplay.
It would be nice if it is noticeable when it is an invite to a game vs someone coming online.
Paper Yoshi commented
It would be nice to just hear a different sound right away to tell if notification not Ex: a friend getting online