<< If I can add a question, is it possible to have a jiggle parameters for the array to add some imperfection in the placement of the objects?

You can use some random selection of something ;)

Take a look here at this thread ;)
http://moi3d.com/forum/index.php?webtag=MOI&msg=3974.1


And for jiggle look at this one
http://moi3d.com/forum/index.php?webtag=MOI&msg=6447.1