This is UX feedback from a lazy user. Why make me type in a login and password? Especially one that I have to remember from the previous screen?
It's trivial effort to just setup an auto login based on some query string parameter right? As in, url?demo=true results in either populating the login/password fields so all I have to do is hit the button, but then it's also trivial effort to just add in some JS that triggers the button for me, thus auto login.