Store password in the database is grayed out

I discovered I could create a "portable" version on my encrypted thumbdrive by copying the contents of the installation folder over. I also copied the Connections.mdb file and added it as a data source in the portable version. Works very well. I'd like to store passwords in the .mdb file as well instead of on the local computer however, and that option is grayed out (Store password in the database). Is this referring to a SQL database or is it only available in the Enterprise version? I'm more than happy to purchase it if I can make it fit our needs. :-)

Also, is there a way of exporting a group and retaining the passwords to give to another user? I only want to export a subset of everything for a particular client.