Sure thing Imran! I'll tell you the way I did it which may not be the
best way but it works:

Grab the 3.9.6 kernel source in .tar.bz2 format from kernel.org.
Extract somewhere in your user directory.
Go into the /drivers/input/mouse folder and open elantech.c

Since I have no idea about applying patches, I just removed the lines specified 
in the patch file and added the ones specified.
To be safe I attached a modified elantech.c you can just replace the old one 
with. If this isn't OK someone please tell me and I'll remove it btw. All 
credit goes to kendatsuba of course for the changes.

Now...
1) run "make oldconfig" and press enter to any questions, which will select the 
kernel defaults for any new options added between your previous kernel and this 
one.
2) "make -j`cat /proc/cpuinfo | grep -c processor`" -this will run make on a 
number of processes equal to threads your processor has. This can take a while, 
on an i7-3636QM (8 threads) this took about 10 minutes. 
3) make modules_install
4) make install]

And reboot into the new kernel.

** Attachment added: "elantech.c"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1166442/+attachment/3704984/+files/elantech.c

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https://bugs.launchpad.net/bugs/1166442

Title:
  Elantech clickpad/touchpad lacks multitouch features.

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