Was just thinking about it. When I used Rage earlier. Would love to have some sort of notification/timer for when you have buffs/debuffs on you, so you know when it runs out.

Suggestions could be:

Top right hand corner above chat box showing an icon with a timer

Beside the player names on your UI with same icon/timer

or

Actually on the icon itself. Showing a timer in front of the picture of the icon.