REQUEST: Sign-in with PIN

Microsoft Windows has a great new feature to sign in with a PIN rather than a full-fledged password to get to your workplace easier while at the same time keeping your root filesystem protected by your original password, of course it explains to the user the security implications of using a PIN rather than a full-fledged password, but it is like said at least much easier to use something 4-6 digits just to get to a web browser or do ordinary day-to-day tasks.
Please add this feature to Ubuntu.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: unity-greeter 14.10.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
Uname: Linux 3.16.0-24-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Nov 24 08:01:48 2014
InstallationDate: Installed on 2014-11-08 (16 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: unity-greeter
UpgradeStatus: No upgrade log present (probably fresh install)