You'd better choose a different scanner, something like Microsoft Fingerprint Reader 1033 (or the same model in the different box -- Digital Persona Pro UareU 4000B). Both are dime-a-dozen, well supported using
libusb and there are plenty of software available, including PAM modules for easy identification using the finger instead of the password.
Also, since these scanners provide a raw 8-bit grayscale picture, it's easy to change recognition backends or even write your own software, and the database of the fingerprints will be limited only by your imagination (and your external HDD size =).
Sparkfun scanner does not allow to capture raw images and only stores about a hundred of templates -- it's not nearly enough for a family of 3 or more, let alone using it for a small company office or any communal space.