Second of all, I would like to mention how easy Instructables is to use. It's just so much easier to give instructions when you can label your pictures and answer comments.
Lets get to business...
A couple years ago I followed this instructable: Add a rapid-fire button to your mouse using a 555 timer
It was easy to follow, the schematics were a bit confusing. It only works on wired mice (mice that run at 5 volts), but in the end I accomplished it.
Today is 2013 and my desk is a little more cluttered than before. I found a cheap wireless mouse in Hong Kong and I loved it. It extremely portable and compact. It wasn't glitchy and it was easy to use.
The sad part was that I had to give up my rapid fire button, which meant giving up the ease of firing pistols at lightning speed in Counter-Strike.
I looked all over the internet to try to find how I could add a rapid-fire button to a wireless (1.5 volt) mouse, and the only thing that could help me was this.
It seems like no one has gotten it working yet, so I decided to try.
Here is a video of it working:
Step 1: Schematic, parts
LMC555 timer (LMCMOS)
3.3 uf capacitor
Button THAT FITS YOUR MOUSE
NPN transistor (depends on what type of mouse you have)