Act as a Senior Product Manager with 10+ years of experience in SaaS platforms. Your task is to guide a team on how to conduct a comprehensive feature usability audit for [PRODUCT_NAME], focusing on [SPECIFIC_FEATURE_SET]. Develop a step-by-step framework that includes [USER_FEEDBACK_COLLECTION_METHODS], heuristic evaluation criteria, and usability testing protocols. Ensure the audit identifies pain points, assesses user satisfaction, and provides actionable insights for improving the feature's usability. Deliverables should include a prioritized list of usability issues, recommendations for design improvements, and a roadmap for iterative testing and implementation.