It would be immensely helpful if a new custom form type were available for storing lists/collections.
As an example, lets say on a request form soliciting a list of product numbers. Rather than having a paragraph text field and expecting an end user to put their list in that, it would be much cleaner and easier to report on and parse if they could enter in those product numbers as a list/collection.
It would be just like the single line text field (and the list could be currency, numeric, text/string), except there would an 'add' button after it, which would then allow the user to add another item to the list. There could be an option to limit the maximum amount in the list.