My Options Menu needs help

[firestalker]

Options_Menu Script This is the actual script, but it's almost useless without the other scripts it changes. though I think the game menu might work okay for the most part.
My Full Project Folder This is so you can see how all the scripts interact with the Options Menu...

But that's not to say it doesn't have it problems. In fact I'm coming for help with them.

1. The Fullscreen Toggle doesn't work: I don't know if it's a problem with the script or the added bonus that DerVV put in that prevents the alt+Enter function, but the toggle doesn't toggle. Just saying. Help with that is needed.
   
   
2. How do I save the changes to the Config File? I'm not sure I did it right and I think I did it wrong because of another problem I'm having. Again help in this would be great.
   
   
3. The Window.index gives me a Window_Selectable error when the index is not equal to @menu_item: Pretty self explanatory, but I'll go into more detail. I tried to set up the index of the different windows according to the setting in the config file, but it always throws me an error when I do that. Only thing that works is @menu_item or and actual integer.
   
   
4. How to change the default font color permanently? I managed to change the windowskin, but for some reason the font color will not change. Help, please...
   
   
5. I'm sure there's easier way's to do all that I've done in this script, can someone look it over and help me clean it up? < all you need to know.
   
   
6. Is there a way to change Constants from one script when you're in another? I want to the the ATOA ATB constants [Speed, and Wait] from this script, but I don't know how to do it. Can someone give me a hand? Just a simple code or something?
   
   
7. Can you make a simple true/false if statement in a script in order to turn it on/off if needed? I want to turn off a script from my options menu, but my technique[or idea] didn't work. Again can I get a hint or a general poke in the right direction?
   

Thank you to all that help me out... I really appreciate it.

Oh yeah, almost forgot - in the project folder provided above, you can get to the options menu by either going to the menu and going to the Quit button or you can talk to the little old lady washing her undergarments in the middle of the field.

Thank you again in advance,
Fire