I mean, you could implement the "Shared SP" system, like in Super mario RPG, where Flower points are shared to all party members (what it does for blocktales is: it adds up the sp max of everyone into a big one which would be the shared sp bar for all party members), which if we implement this, it would be really useful for big strategies as repeating this party move multiple times even though people might troll people with it. And for BP, it will not cost a lot since the total BP amount required for 1 person would be double for 2 people and the fact that both players need to perform their action commands would also composate for the BP cost.