Add a Dropdown Menu to your Special Requests/Notes Field
You can customize the name and add a dropdown menu of options to your Special request/notes field on your public waitlist add page.
Go to Settings > Public Pages and add the predefined options you want to offer in the Special requests types field:
Press Enter between each option to save it.
You may also want to check the box for Make Notes field its own column to separate out the Notes section to make these notes more visible at-a-glance: