Hi Marc,
Notation Composer is intended as a composition assistant and sheet music printer for "the everyday musician". As such, we've worked hard to make tasks that most of us would do for arranging and creating music to be easy, and to give a usable printout of that work. Finale and Sibelius are primarily music engraving programs intended for music publication and professional use. The printout that you receive from those applications will be more "polished" because that is their goal
If that's what you need, then you'll want to purchase one of those programs. They only cost several times more than Composer
ttfn,
Sherry