Sound Off! What's missing from your favorite operating system?

Whether you're running the latest version of Android, iOS or Windows Phone, there's bound to be something missing from your favorite mobile operating system. Personally, I find it amazing that iOS still makes me play Whac-a-mole when it comes to clearing out my notifications panel. What are some features you can't believe are still missing? Sound off with your fellow Engadget readers in our forums.