Allow discount codes to be editable and be able to create excluded dates within them.
Currently, discount codes are not editable, which means you would have to delete one and recreate it - but if you try to use the same code, it won't allow it.
It would also be extremely beneficial if you could make discount codes for a long period of time but with exclusions, for example:
If I created an off peak promotion and I wanted it to be valid between October 1st - April 1st but I did not want it valid for peak holidays like Christmas/New Year (16th Dec - 2nd Jan), February half term or Halloween. It would be great to have something to enter dates that are not included/exempt.