We leverage custom fields a lot. There already exists an option for a dropdown list but this list is just field after field and isn't even sorted alphabetically so when it gets long it's hard to manage in the admin and when it gets long the dropdown option on invoices etc isn't sorted which makes no sense. Ideally the fields stay sorted or have the option to sort in both areas and ideally there is an easier way to bulk add the list via CSV or just a box that's separated by line item. Or maybe feed off another list account reps etc. Also, more advanced reporting by custom fields would be nice.