Currently, when autofill is enabled the last username/pw combination used is automatically filled in. Or you can use the shortcut CTRL + SHIFT + L to put in the last one. But if you need to switch to a different account there’s currently no way around the plugin window.
A shortcut, that just cycles through all the entries for the website (oder by name or by last usage) would be a nice and quick addition. Or just make CTRL + SHIFT + L the cycling shortcut.
Love the app so far, but sometimes the interface and usage can be cumbersome.