1. "Wrong password" message box should close by pressing "Enter", without mouse. Because it's intuitive, user can re-enter password quickly, and wrong password messages is annoying enough anready, no need for another inconvinient things
2. Writing language indicator near the password box. "En" and "Other". For those who have more than one keyboard languages. Because you need to guess which language is active right now, or alt-tab to see it near the clock in Windows. In other words, it's the same thing as Caps, but there's no physical indicator on keyboards for it.