If you had a level of security requirement where you were worried wiping the fingerprint reader after using it would be insufficient, you can add a device password. Which is protected from brute force attacks and doesn't have to be different for every website.
However such an attacker would probably also throw in an old school keylogger at the same time, because why not?
If you are worried about someone like me having a strong motivation to compromise you, your windows 7 system is already riddled with spyware... logging every keystroke and stealing every cookie, sending it to me in realtime. Are you at least using TPM based full disk encryption to make it more interesting for me?
Security requirements vary. Biometrics in practice are way more secure than passwords. Which is why even websites requiring passwords you should use a random password that is stored somewhere that you unlock with biometrics.
There is a reason that the way to identify a real IT professional is where they look when a user is typing a password in to their device or entering a PIN in to a payment terminal etc.*
* Note: The one time a professional DOES look at the PIN pad as someone types the PIN is when entering a building they will be working in. Those who started their career looking away should eventually have learned that lesson...