Is there a way to change the values for Quick Launch, from regedit ?

In this case, i could get ride of the Apple button, and replace it with the original one ( smaller )
What do you think ? Would that work ?

I have no idea, I don't know this tool or this theme, you'll have to try it out.
Switching back to the original smaller one will probably work, but if Microsoft is able to make the default large Windows/Start button work, your apple button which is approximately the same size should work too, you just need to find out the technical requirements for this button.

I stopped wasting my time on such vanity and customization tools long ago! ^-^
If you want a Mac look & feel, get a Mac.

Otherwise, stay away from third-party tools that introduce dependencies and maybe even security Trojan horses, that would probably won't work when you upgrade to Windows 8, and that require users to spend too much time to understand and configure.
You probably lose features too: Does your apple button glow when you hover your mouse over it, like the default Windows/Start button does?

IMHO this is wasted knowledge that you are not likely to use at school or work. Unless you are actually a developer for such a tool, there are other Windows or computer customization areas that are much more useful, for instance for performance gains.

Ok, i'll leave it like it is now.
Thanks, anyway.