It's not supported in the default routine and there aren't plans on adding it.
Ideally, you need a custom routine for that skill because it's no longer an "aura like" skill. You have to keep re-casting it. However, I don't know of a good default behavior for it because how often you want to re-cast it really depends on your build/gear.
When I did some recent updates to the routine, I tried having it cast when it wasn't active, but the results were terrible. You don't want the bot continuously re-casting it when it runs out, because then you're spending more time casting it than killing. Then, you might or might not want it re-casting in the middle of combat. However, if it's so important to cast for some builds, then you'd most likely have it with some increased duration or something to help keep it up, but that's an assumption the generic CR can't make.
In short, the specialized nature of needing to use that skill, along with the inflexibly of customization in the current routine design, makes it so it's not worth adding, because the end result will be the same; if the logic doesn't work for your build, then you need a custom routine.