There's a quick fix to let you type the full username without typing the whole name. As you start to type "Ti" (The username for TimeWorker)- Press TAB to get the whole name.
The problem with that shortcut is that if there's more people with similar start with the name, you have to type the name you want more than just 1-2 letters, otherwise it can think you want the other username.
And it "copies" the whole name, so if the username is like this "TiMeWorkEr", The TAB-shortcut will copy exactly the same.
Hope it helped you.