YES! The auto dim mirror is a great mod! If you do it, get one from a 2007 and up Altima. Make sure you get as much of the harness as you can.that is one of the easiest mods to do.
The other one I would personally suggest is the autodim rearview mirror and the SL armrest if you happen to find one that's not destroyed. Both are very easy to mount. Then you could add a keyfob if you don't have it.
I also added a glovebox light.
You can check all my mods here , you can ask me if you need more info.
I'm giving another try to the cruise control next week or so.
I don't remember if I got the wire channel from an Altima or Maxima.