Hello,
Long time user here. One thing I would really like to see is storage of the sticky password database "in the cloud". Perhaps you could use Amazon's S3 storage service or another provider. I would HAPPILY pay an annual subscription fee to you if this worked correctly. Of course there are several security issues to consider but as the developer of a secure password manager, I'm certain you could work it out. I use SP on three different computers (work, home, laptop) and it is quite inconvenient to always have to sync the 3 of them. Of course the database should be accessible offline as well and have some sort of sync and conflict resolution mechanism for multiple changes.
Great job with v4 -- looking forward to v5!
