Sorry for the late reply.
When an instructor enables a feedback forum, students can enter their feedback. For the instructor it is difficult to go through all the feedback entries given about him. Therefor using a text summarization, the instructor can summarize all feedback and have a feedback summary which contain the summarized idea of all feedback entries. Summary can be automatically generated using automatic summarization techniques.
Existing Summarization Techniques
There are generally two approaches for automatic summarization. They are Extractive Summarization and Abstractive Summarization. Currently the abstractive summarization is is in dvelopment level but extractive summarization is almost completely developed. What extractive summarization does is it extract most suitable sentences from the source and present those sentences as a summary. That is what I was thinking to present as a plugin for Moodle.