There's a paid app in the Market called WidgetLocker that has a setting to wake the phone by pressing any hardware key on the phone. The catch here is that it's main functionality is to replace the default lockscreen on your phone, so it won't work with the fingerprint scanner.
Or, you could still leave the default lockscreen active in addition to the WidgetLocker lockscreen to keep the scanner active but then you'd have to go through unlocking both lockscreens to get to your phone's desktop.
As far as I could tell, there's no way to to only have 1 lockscreen between using both apps AND keep the fingerprint scanner active.