Button functionality: Summon multiple units

I am using boosted knight at the moment and boy is it a struggle with high leadership. I’m constantly pressing the knight button, trying to move my king and casting spells all at the same time. Leadership renews faster than I can press at certain points and the spell buttons are often non responsive due to the touch screen overload.

What would be an ideal fix is if we could use a long press option to summon all units we are capable of given the amount of leadership stored.

For example if I have enough leadership to summon 10 knights one long press brings them all out at once giving me the ability to multi task and avoiding the button insensitivity issue for spells/scrolls.