Add a custom field to Edit Product page. Add a custom tab to organise it.
Change the text without modifying the template file.
Insert CSS selectors into the markup to highlight a specific shipping method.
Create an options page with checkboxes to disable dates in DatePicker.
Defer WooCommerce emails for a specified time after the normal delivery time.
Add an email address (or two) as BCC to all WooCommerce emails.