Here are the questions you can use to qualify new features:
Does this feature serve your exact ideal customer, or does it make your product interesting to new customer categories?
Does this feature serve the user’s big goal, or does it add other goals to their plate (even if solved successfully)?
Does this feature facilitate the user’s most important daily tasks, or does it add other tasks to their plate?
Does this feature breed new objects to be managed with the app?
Does this feature solve a pain, or does it merely add an extra layer of polish?
What are the development and support (!) costs of building this feature?
Can this feature be easily replaced by building an integration with another software product?
What part of the existing user base will benefit from this new feature and start using it immediately?