Released in 2.1
Alex, great to see you started implementing this feature. Just yesterday i thought how important my data is and how easy it can be deleted accidentally. Recycle Bin will be a great security feature to me.
Yes, this feature is long overdue.. also will be great for Simplenote interoperability, since Simplenote has Trash and currently we don't..
To be more specific, "Delete notes older than X days", not to be confused with "Empty Recycle Bin every X days", so every note lives X days.
30 days is a sane default value.
Customer support service by UserEcho