I'm about to create the control rig for my character's arms. Like the legs, it's going to be based off IK solving, though it's going to be a bit more complex. Unless you're making a dancing game or a fighting game, your characters are unlikely to have as complex movement in the legs as in the arms, especially when it comes to twisting. I'm going to need to test my shoulder controllers with the arm straight (as in bind pose) and with the elbow bent. And I'll probably want to go back an forth between those, which is I'll create a character set.