It would be super helpful to have custom field data validation options. For example - I need to collect routing numbers that are exactly 9 digits long, or EIN's that are 9 digits long in a format of XX-XXXXXXX. When someone enters something other than that format it should give them an error message. Excel, and other Task management software have this feature, especially for Form Fields that will be submitted by a number of untrained users. Simply giving them a text field to put in whatever they want gets bad data that constantly has to be cleaned up.