There is a Re-login Script, but am not sure how to set this up to selectively present the user with a new password dialog instead of using Re-login to always pop it up...
It's crazy that if the user checks the box to remember their username and password by mistake there is no way to remove the auto login, not much security there.
You can remove the auto login, but not from inside FileMaker. In OS X you have to go to the Keychain Manager and remove the saved un/pw. Not sure what the equivalent in Windows is.
Oh wait, maybe there is a way in FileMaker (this is new to 14): If you go to 'File -> File Options' there is a check box under the 'Open' tab for 'Allow Keychain Access to save password'. I would assume that if you turn that off, you can at least prevent users from saving their passwords accidentally-on-purpose. The other option here on this screen is to set up the file to log in with a specific un/pw. To make that work, you wouldn't want to specify an actual name and PW, or it would just log in with those credentials. But if you left the PW blank, say, or you gave it an invalid name (e.g. "enter name here"), then it would try to login, fail, and then present the user with the login box again.
Hope that helps.
Thank you, it was in file options.