Thank you guys very much!
eckhard, first of all thank you. But, the way you described it was exactly the way I used to think about it...until I started reading Handling the Big Jets, one week ago. It describes the forces on the controls for Aft CG as: EASIER AND LIGHTER. Fwd CG: Srong control forces. Thats what bothers me. This book is a great reference, at least inside my country (Brazil). Maybe I'm overrating it's content, maybe not.
The way Genghis described made me understand a bit more about the stuff. With a fwd CG I may say: ok, it's more easier to fly with an engine failure because of it's stability. The engine still operating will find it difficult to move the aircraft because of its CG position. But, if my job is to put the aircraft into a steep turn, let''s go with an aft CG. That's what I got.