The release notes included a change to Arcane Archer that I am unclear about:

The effect of Ranger (and Elf) Arcane Archer : Imbue Force Arrows has changed to:

* Benefit: Imbues all missiles that you fire with arcane force, granting them the Force ability (+1d6 Force damage) and negating the incorporeal miss chance of ethereal creatures. This ability costs 10 spell points to activate, and triggers a lengthy cooldown of the Magic Missile spell. Only one Arcane Archer Imbue ability may be active at any time.
Does this mean that I activate this like a stance, and it then applies to whatever arrows I am firing? For example, I'd either pick normal arrows or conjure my 100 AA returning arrows, drop them on my ammo slot, and activate Imbue Force Arrow?