I've searched around, but have yet to find a detailed explanation of what the UI options do. Some are easy enough to understand, but others are not so clear. Wish I was at home, I'd make a list of the options I specifically would like to know about (interaction on/off? interaction of what?). Has anyone seen such a list anywhere? I could turn EVERYTHING off, but I might want a little help. Thanks.

Interaction on/off in my guess toggles the context sensitve icons on the screen like press space to do x....etc.
If you set it off you will most likely be completely hudless but it makes for more of a movie appeal.

Just play around with the settings until you find something that you like. Yeesh.

I second this. Please some1 explain all hud options. I'm just about to start playing