Hey. I have a 2SS, and the ABL stays on even if all doors are closed and moving. Of everyone that i've given rides to, the ABL is one of the most frequently noticed and complimented features of the interior. But to answer your question, I know there was a post sometime last year about someone installing it themselves.. Check out the DIY section?
Oh, and as far as I know, you can't dim them. However, they aren't any brighter than your radio's light.