Default New M8: Menu Button? Immersive Mode?

Hi - I have a new One M8. I have 2 questions:

1) Is there a way to replace the App Switcher button with the Menu button I have been using forever since I got my first Android phone? It seems to be a lot harder to get into various app settings / phone settings now.
2) Is Immersive Mode enabled right now on the M8? It doesn't seem like it works on anything (like the browser, for one). Is there a setting I need to change to enable it?

Thanks,

żGJ?
żGotJazz?

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