It would be very helpful to have a "code" form field available in the "Advanced form fields" section.

It would also be very helpful to be able to reference one or more CSS files for each form, not just a single CSS file for all forms, as is currently the case through the "Global CSS" setting in the "Form Settings" section of the "Organisational Settings" area of Advanced Forms.

Both of these features could be restricted to users with "Forms Admin" privileges.