Comment 30 for bug 216697

I'm not sure, if I would like this authentication-without-username-selection feature. I have several accounts on my machine, too. Sure, you could use a different finger for each account, but this way, you have to remember what finger you assigned to which account and you could easily end up using the wrong finger by accident and login to the wrong account. This could be annoying.

Another problem would be, that you can't force users to use different fingers. What if a user assigned the same finger to several accounts, which account should be selected for login? Or would you like to prevent this scenario by the following error message during fingerprint registration: "This fingerprint is already used by a different user, please use another finger!" ;)

I have set my KDM to automatically pre-select the last user, so I think in 97% of the cases there is no need to explicitly select a user and just swipe your finger, because you're the last one who logged in and you want to use the same account again.