You can define that of course. Basically you add a new section to the engine file and define that it is via "type". A "type=extract" will not show up in project settings and will perform extraction of the data from whatever you define there (get content from an url, from last submitted form, local file...). You can also set it as "type=text" and it will show in GUI to have people enter something that you can later use on the submission process.
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