You might be bothered that the notifications are a bright white on an otherwise generally dark browser, on top of that the notifications tend to stay on the screen for sometime. Some notifications will stay on screen for upwards of 30 minutes, you might not always wanna manually close it out when it pops up. Wouldn't it be nice to have the ability to control how long the notifications stay, and whether you need to manually close them or not. To be able to change the color of the box to match your browser and not stand out like a sore thumb?
Personally I would really like this feature added, it may seem small and not worth the effort but in the long run I guarantee everyone will be happier with this ability.