also that the potions and pay for healing with the priests of The Three cure to your partner?
What exactly do you mean? Potions work for companions, you have to use it in companion inventory.
About the auto cooldown, that would destroy the balance, specially for summoner (mage or cleric), you could summon endless a golem or wolf, so that's a bad idea. Also the battle is never over, often an enemy appears, so resetting the cooldown would be also technically difficult to implement
I see, it's a shame, because the summons of magicians and cleric could handle with limitations, something like two summons by dungeon, or could be fixed otherwise, there are options, but I guess it would be very complicated after all this time, I expressed poorly with the potions, I wanted to say that if there was not a potion or a quick slot to use it in me and my partner at the same time, I do not like to be entering the inventory to heal myself or my partner. Thanks for yours answers.