The headlight switch turns on the tail lights since the daytime running lights run only the headlamps. THere should be a small screw on the headlight switch to turn off the daytime running lights if you want. I did. If you turn them off, then the headlight switch works as it should in all three positions.

I can't remember about the green light (It's been three years since I shut the daytime lights off)

On the tailgate, find the anti-rattle kit at ipdusa.com and there is a PDF file with instructions on removing the panel.

Good luck

Pedro