Description:
On the right-mouse option on a document tab, add the option to "Close and Delete" intermediate or temporary files once they are used (incorporated into another PDF). Adding a confirmation would be acceptable.

Reason:
Efficiency: When building a PDF using multiple source PDFs, many generated PDF's may end up being temporary and need not be saved, yet many are automatically saved and clutter drives. The user is then forced to hunt down the temporary files and delete them. If a bit of time goes by before that happens, one may feel the need to confirm if a temporary file got included in the document being built, wasting more time.

Acrobat user for 30+ years.