If possible, it would be awesome if there could be a class or ID added to the sections of the registration process that are custom fields that reflected which custom field they were. Similar to the way that the default profiles have something like "id="field_#"associated with them. Given that you can make it optional to fill out these fields, it would allow for some really interesting customization.

Not sure if it's possible (or probably, generally speaking) to implement, but thanks for reading and considering!