Portfolio Item Expiry Dates - Option to set to # of day

AISS checks are an Eligibility check which must be conducted to determine eligibility for all students who wish to access specific funding through the QLD Government. These checks expire after 30 days and must be re-conducted when a student does not commence within 30 days of the check.

When creating a portfolio type and setting up the expiry date it only allows for expiry dates to be set automatically to the # of months and not the # of days. Because all months are not 30 days this makes the automatic expiry date function not usable for items like this.

Can this be changed so the there is an option to select days or months and then set the appropriate number?