Sublime - Activate/Deactivate - Auto Save on Modified -- Plugin - plugins

Question

I am already aware of the user-defined ignored packages setting in SublimeText2. Is there a way to modify this plugin -- e.g., with a keymap assignment -- to activate or deactivate this useful autosave feature? Perhaps chaining a plugin to the package control enable / disable feature, and assigning a keymap?
Here is the link to where I first discovered this plugin: Is there a way to autosave on each keystroke in sublime?
import sublime, sublime_plugin
class SaveOnModifiedListener(sublime_plugin.EventListener):
def on_modified(self, view):
view.run_command("save")

Answer 1

You can do this without relying on the package control commands. I can give you the answer, but I know you have been exploring writing plugins, so this might be a good exercise. It's pretty simple. Here are a couple hints though.
In the on modified command, you can check for a setting. You can give it a default value (I would do False) for if the setting does not exist. You can either write a text command to toggle the setting, or simply create a key binding with the toggle_setting command. Both will work, though if you write a command you can do something like create a status message so you know if save on modified is active or not. For information on toggle settings, see http://www.sublimetext.com/docs/2/settings.html.
If you just want the answer though, just let me know and I'll post it.

Answer 2

You can do this:
Go to Preferences -> Settings
Add the following line:
"save_on_focus_lost": true,
It would not automatically save the current file, however it would when you change the focus on other windows, Alt + Tab to terminal for example.