If stalling as it is is not going to be removed as a bug. I think it should be implemented into the game in a way that is more intuitive and less clunky.
I see two possible options.
One. Add a high end ability with mid to high stat reqs that lets you charge it with one cast of an ability by spending adren at a bank/outside combat. Letting you cast it for free whenever the storage ability is next cast.
Two. Add it as an unlimited use item that does the same. An ability scroll with mid to high crafting reqs and material cost that can be charged at a bank/out of combat for adren, then cast like an ability when its placed on the action bar.
Both would let you use one big ability of your choice.
Possibly minus sunshine/meta/zerk/swiftness/living death for balance reasons.
At any point durring a boss fight.
Weather or not they would keep the current stalling "mechanic" along with the new feature would be up to the devs.
Personally, id want to see it removed in favor of this.
Either would keep end game players happy and expand where they can use stored abilities.
While also giving everyone else a new tool to help with rotations and give them a bit more power.
Thoughts?