Yes, as I did say it would be optional. Depending on how you wanna set up your hud.

And for your 'problem' again PvP.
War has two single target combos and one AoE combo yes?
Your issue is that Storm's Eye and Storm's path start from the same root ability.
Well two combos = 2 buttons. while the first in the combo is going to be the same button doesn't matter which you hit when it branches the two different paths will be on two different buttons and thus you choose which to press to finish out the combo.
Just like in PvP.