Not quite what you want but do you know this is now a plugin
10.4.7. Keybox
Keybox is an encrypted password storage using the “Tiny Encryption Algorithm†with a key derived using md5.
Using Keybox
To get started, start up the plugin and select Enter Keybox. The first time you enter Keybox you will be prompted for a master password and for confirmation of the master password. The master password is the password that you must use to access your stored passwords.
Once inside, enter the context menu by pressing Long Select. From the context menu you can create new entries, delete entries and edit entries. Each entry has a “titleâ€, a “user name†and a “passwordâ€.
Selecting Reset Keybox from the main menu will delete the current list of passwords and a new, empty list will be created the next time you select Enter Keybox after prompting for a new master password. Entries are automatically saved when the plugin is exited.