This is a thing that is a massive pain when I’m adding a new booking as an admin.
Many times, people will call for a reservation and will request for a better price, etc.
It’s VERY inconvenient to go through the rates, change the respective rate in order to set a custom price just for a single booking, make the booking and then revert the rate back to normal again.
Allowing the admin to set an ad-hoc custom price in the “Add New Booking” form for such cases would be ideal.