Tracking DnD cooldown

Hello everyone,
I'm trying out the morb spec and ran into the following problem with my weakaura:
I want to track the actual 15 sec Cooldown of my D&D ability. Currently, after i cast D&D, the WA will display the correct 15s cd. The problem: After the 15s CD is up and i spend my runes on another ability, the weak aura will go back on a 9 second cd. This is factually correct, since i cant use DnD until the runes are back off CD. But i dont want to track wether D&D is actually usable or not, I want to track the 15s second cooldown of it. To this end Weakaura has an option "ignore rune cd" you can click on or off, but this doesn't seem to do anything for me.
Did anybody run into this problem before or can provide a working weakaura?
Thanks