English to French Tech/Engineering IT (Information Technology) application feature

C'est un guide utilisateur pour un logiciel de gestion du cycle de vie des applications, chapitre gestion des exigences..

The Undefined Requirement type can be used as a placeholder for requirements that will be defined at a future date. For example, suppose there is a Reporting feature of the Flight Reservation Application that is considered a **stretch feature**. If desired, we can create an undefined requirement as a placeholder - it will be redefined as the requirement is being developed.

Que signifie "stretch feature", est-ce une fonctionnalité supplémentaire, facultative, à développer ultérieurement ou tout autre chose.. ?

Merci