As default Merge Form Field displays text as Single Line Text and often text from a web form disappears if it's too long. They only way the text breaks lines is if it's linked to a Multi Lines Text Field from a web form.
Now with Fill Areas if I want to overlay text from a Keyword type index in workflow to a fill area that wasn't linked to Multi Lines Field it behaves as Single Line Text.
Could you give us an option to choose Fill Area behaviour (as a Single Line Text or Multi Lines Text), please?