I can't believe I never thought of that. It would be so much better to just not need an extra button press (or two for if the powers are on cooldown and I'm checking to see if they're available). Assuming there's not any combats where it needs extra buttons.
And if there ever was or will be, then the spot in the middle of the top row could very well be the flex spot for that, which could then lead to another menu instead.
Resummon should work with the sporeling. You have to summon it and then next if you are faster, use your encounter power and then it should refresh and be cast again. This does not work currently but should.