Hey update:
I found possible solutions to being able to recalibrate the sight using wiimote so that it can be set to precisely match where your wiimote aims. Actually I have four solutions and you do not have to buy anything :P

As you all know I use wiimoteoncod9.exe, BUT here is the list and I will post all the needed info later with script so you can do it yourself.

1) use Toid's wiimouse (easy to find and download) and use custom script with absolute mouse setting (its the default Windows cursor mouse) and set your keys or gestures according to your preference. You can add a button with a function to freeze the cursor in place while you line up your wiimote/wiimote + handgun/wiimote + zapper. Then make sure you have the right border settings so that the wiimote loses connection once it hits the screen windows border.

Sounds awful doesn't it? Do not worry, I will put it together for you in the next few days so you do not have to do any work.

2) use wiimoteoncod9.exe with autohotkey to make a scripted command bound to one of the keys on the wiimote or nunchuck that also freezes the position of the cursor (stops input) so that you can align the cursor with the rifle you are using so that it stays aiming where you point. This way you can always reset position if you feel it went off-alignment.

I will also put something together later to help you guys out who own wiimoteoncod9.exe.

3) Glovepie: use a simple absolute mouse setting with all input keys/gestures set in (NOT lednergs setting) and add a key input on your wiimote/nunchuck to freeze cursor so that you can align it. You can just use the nice script given by the developers above and edit it.

4) beg developers to add the ability to edit all inputs, add an input to be able to stop cursor for alignment and also to have influence over the cursors role once you pass /touch the screen borders. :D