A viewer brought to my attention that the Weather Pain button and the control lock button are the one and the same.
Unfortunately, the control lock feature becomes moot for bosses where a Weather Pain is necessary, such as Ancient Fuelweaver, since the player has to hug FW to hit their weather pains so that he doesn't heal to full HP.
I believe a rebinding option for the control locking would solve this issue? I'm not sure how it's been coded in-game, but since it requires a button input, I'm going to assume it can be rebinded.
Refer to this thread here: