Passpack's 1 Click Login can handle multiple logins on the same website. Press your Passpack It!button as you normally would and if there is more than one entry that you need to choose from, you'll see a popup like the one below.
Click the entry you're interested in and Passpack will log you in.
(oh and if you change your mind, just press ESC and the popup will go away just like with any other Passpack popup)
To sign into a site using the Passpack extension, select the Passpack icon next to the username or password field on the site.
Then select Sign In for the account an account and the Passpack extension will take care of the rest.