I was told by a member here that they lost 7 figures from a liquidation of leaps. It was system error. Why would anyone want the broker to act without the opportunity to reduce yourself.
Hence, I advise IBKR customers to avoid using margin on options. ALL the lawsuits against IBKR that involve autoliquidation are related to options. There is always the possibility of bugs in the autoliquidation software. I guess the risk is higher for options.