I use a lot of keyboard shortcuts in my daily life, since using the keyboard for the most part is a lot faster for me, especially since I need to do a lot of writing in between my browsing.
I find it personally super aggravating that every time I need to login with a user account, I have yet found a hotkey to, for example open up the same password search that can be opened by clicking the icon in the username and password fields. ALT+W opens up a password search, sure, but even then you need to use the mouse to click the user account you want. As a power user, in the long run this makes my wrist hurt, because let's face it: power users love keyboard shortcuts because less mouse clicks and reaching for your mouse is always better. Especially if you gotta do it dozen times within a 30 minute period.
I'll give you an example of a password manager that does this correct: F-secure Key. In Key, you only gotta press CTRL+F2 and a list of available passwords is given to you. Another thing Key does right, is that you don't need to click a search icon to start searching, just start typing right away and it'll find them for you as you type. And most important: when you wanna select the user account you wanna sign in with, you can move with the arrow keys and select your account.
Due to work I need to jump around in a lot of different user accounts, so it would be amazing if something could be done to the workflow to make it suck a whole lot less.