Hi,
There is no option to allow today with the only future dates setting activated.
The cut off time you're takling about can be setup with the "hours for extra day" setting so that if the hour you configure in that field is past, it shifts the limit to one day in the future.
So if you set 11 in there, after 11 am, the customer won't be able to select dates in the past, nor today, nor tomorrow.
The waiting days option allows you to enter extra days of waiting. So if you enter there 7, the customer will only be able to select dates after one week + 1 days.
You can try entering -1 in there. Maybe it will allow the select of today before 11 am.