Custom fields can be added to the User Registration page. This page is part of the registration process when a new applicant creates an account.
All question types except File Upload, Text and Upload, and Nested Lists are available on the User Registration page.
For GLM sites, note that custom fields cannot be added to the Executive Officer section of the User Registration page.
A best practice is to collect more static information at registration, as you will not have a record of the original response if the information is changed. More dynamic information that tends to change from year to year should be collected within a request (i.e. on the application form).
Custom fields on the User Registration page can be pulled into reports and merge templates.