Ability to create a discount if the guest has a paid Friday and Saturday night stay

I would like to see a feature added to the discount creation tool so that I can offer a discount if a guest pays for a weekend stay. 

For example, I would like the ability to offer a free Thursday or Sunday night stay (or a credit equal to that amount) if the guest pays for Friday and Saturday night.

Rent x nights and get an additional night free or at a specific discount. (with it being smart enough to know which night would be the least expensive night)

And if we use the feature to identify open "gap" night before or after a booking, have the system smart enough to allow us to add the gap night at a discount to the booking instead of creating a new booking at the correct rate shown as added night and a discount on added night... if the original night was OTA then create a new booking with all characteristics of the old booking but automatically adjust things like checkin and out times etc... to make as seamless as possible to the owners/pms and the guests

I tend to think this isn't likely, because it would be an OwnerRez direct booking unique feature - none of the listing channels support anything like this.  So it would be likely to create confusion.

All that I am asking for is the addition of "Contains day of the Week" to be added as a choice as one of the criteria that can be chosen to be met in order for the discount to be given and then a drop down with each day of the week listed so that I can require that the booking contains both Friday and Saturday in order to qualify for the free night.  This is very similar to criteria that are already in the system like "Arrival Day of the Week", "Departure Day of the Week", and "Booked on Day of the Week".  Thank you!