We could do with a way of displaying DoT indicators working backwards from the expiry of a buff.
In this case they're not actual 'ticks' of the debuff but indicators to show when you can get a cast off before the debuff expires.

This is more relevant for Marksmanship hunters.
The [url=http://www.wowhead.com/spell=187131/vulnerable]Vulnerable[/url] debuff increases damage taken from certain abilities, Aimed Shot is one of them and the one which requires this indicator.
As [url=http://www.wowhead.com/spell=19434/aimed-shot]Aimed Shot[/url] has a cast time you need to be able to see if you've got time left to cast it.

I think this means we'd need the indicators to adjust with current haste levels.

In the current config I've just got a two second DoT indicator on the Vulnerable debuff bar, it helps a bit but is nowhere near as clear as other options out there.