To deal with high slippage events as we've seen on 14th October, it would be nice to have only a Stop-Limit-Order (without OCO) as Stop Loss to allow Slippage-safe Stop Losses in combination with a narrow Spread-Width (say 30Pts for example).

First defense line is the stop-limit. In many cases, the market comes back to hit the limit (especially in case of a slippage event).

Second defense line could be an Underlying based Early Exit with limit order as TAT already supports.

Third defense could be to wait for expiry and accept the full loss of the narrow spread from in extreme events.