Default Value and Email Completion Event

We're adding an "Invite Friends" feature to a membership application on our site using Dynamic Forms 4.

Users sign up on Form 1, and are redirected to Form 2.

Form 2 has four fields: 1 Multiline TextBox "Message to Friends" with a default value: "I signed up, and you should too ... blah blah blah." 3 Single Line Text Boxes for "Email Addresses of Friends."

• Users must have the option of altering the "Message to Friends."
• We want the email to friends sent as Plain Text.
• The message we want as Default Value is over 300 characters long
• The DefaultValue field in the DynamicForms_Question SQL table is nvarchar(255)

This configuration truncates our 300-character DefaultValue. I've tried other Question Types, none seem to fit our needs.

How can I configure the module to achieve what we want? Can I safely alter the SQL field length of DefaultValue to nvarchar(1000)?