The boost cut-out in the Hurricane can be switched off because it's a push/pull switch.
I think the one in the Spitfire couldn't be switched off in the real aircraft and that's why it can't be done in the sim either.
There was a gate and pushing the throttle through it would go into the WEP power band, but it probably couldn't be reset back to normal. It was done this way so that the ground crew/mechanics could see if a pilot had engaged WEP during the flight and do the necessary engine checks.
That doesn't mean you are forced to fly with WEP all the time if you engage it once. Just pulling the throttle back will give you normal power again. The boost cut-out does not automatically mean WEP, it works more in a sense of "you can engage WEP if the boost cut-out is enabled" and the way you do this is by advancing the throttle beyond the normal boost.
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