There would be a reason I said this in Beta Having clickies on Global Cooldown (meaning they use Recovery Speed before they become usable) simply makes them a pain to use since we must wait to stop what we are doing for .3-.5 seconds to then use them.
Since there are certain (many) types of effects that can cause issues if they cast while a player is activating another ability, we're being as sparing as possible with charms that can activate while using another action. Instead, we're looking into the solution of making the items queue properly, just like abilities.
Bump. I cry every time I hit the Rod of Ruin on the Warlock and continue my rotation when the click never registered. No recovery on charms 5 dolla!
The mystic spell Barrier of the Spirits have the same issue. I cannot cast it while I am casting something else even though it says I should be able to in the spell description.