When working with LeadConduit classic, it's important to keep in mind that there is a character limit of 255 characters for strings/text fields. This would be especially important to you if you created a comments field, to solicit a paragraph response in your form.
There are no work-arounds available for LeadConduit Classic. We've developed the option in our newest version of LeadConduit to accommodate this need. If you are a current user of the older version of LeadConduit and wish to migrate to the new LeadConduit, please feel free to reach out to our Support Team. We'll be happy to guide the migration process for you.