When you hover next to the door there is already a pop-up that says this person is not online at this time. I "light" although cute, would be unnecessary overkill.
perhaps a sign you could flip over to invite people in? I know I don't always want folks knocking on my door when I'm busy science-fair-ing it up inside, wouldn't want the default to be a blazing announcement that I'm home.
Or a blazing announcement that I'm NOT home, just in case the jujus make it down from Barquala.
Not keen on having a green light announcing my on-line status. I think, people who know me,and want to visit me, can very easily check whether I'm on-line, without having to walk all the way to my front door.
But I would very much like a doormat (that can be picked up only by me!) that says "Wipe yer Hooves" on it! :)
Not a fan of highlighting to strangers visually whether or not I'm in game. At least now, they have to hover over the door (ie, do something) to figure that out. Wouldn't mind something that we could turn on if we're 'accepting' visitors, but something we have control over.
Gnomes are kind of like welcome mats? Are they not?
Lights: You could have an option to turn on lights, like indoor lights or outdoor, like in real life! So people know when/if you're home.