Ember Fusilade needs to a little rework please!

Let's us charge it and keep it by holding the button pressed, and then release it when we let go. Right now even at max charges it keeps casting and spending mana. Sometimes you want to keep the embers and release at a better time, and it's not possible to do it right now.
Also needs a way to track how many embers we have stored somehow, either a buff icon, or a counter on our characters head.