The styles and ex-styles of Slider control is not accurate any more. It's not a big deal, since I can just modify the source and compile the form studio plugin. I just want to remind you that when you have time, probably you need to update the control's style entries to reflect the latest changes.
Or, since you already make this open-source, why not put this whole thing in the GitHub, and let us do this for you. I am sure plenty of people, including me, wants to improve your program and share it to the public as well.
Update: It turns out the AutoIt document is at fault. In one large list it shows all the constants you have written in the program, but when dig into individual controls, the "guictrlxxxx_create()" method has extra style options that's missing.