Updating domain mapping - still needs to go into mu-plugins folder

Howdy - I just updated my domain mapping plugin and can't seem to get away from installing it in the mu-plugins folder as opposed to following the directions and adding the domain mapping plugin to the plugins folder - everything seems to work find if I copy the files into the mu-plugins folder and update the sunrise.php at the content level but I am wondering what I might be doing wrong that I can't get rid of my mu-plugins folder and thereby follow instructions :smiley:.

Thanks for any insights...