Scanning using Laserfiche Connector should be a very quick and simple process for your users.  In my deployments, the user clicks the connector icon, clicks scan, clicks store, then only has to close the application.  I would like to ask, are your users experiencing the same issues when they attempt a traditional scan from within the client?  I would expect each user to have to configure their scan source on the initial running of the web scanning client, however once configured, these settings should be appended to the users attributes and retrieved from the server for future uses of the scanning application.  Try going to a specific user in the LF Admin console, delete all of their attributes, including system attributes, then test to see if the settings are saved after the initial scanning and saving of a document.