Forms - Feature Request - Enable specific Date

I'm using Forms as a reservation formular for a client (restaurant). They have regularly closed every week on the same day, so i set the option to disable this specific weekday.
What i'm missing is a function to (strict) enable a specific date i.e when they have open on their normally closed day.
At the moment i have to disable the "disable weekday" option and manually select every closed day in advance.
Would be nice to implement that in near future. :)

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