But is it SAFE?
Cause, how else can one successfully download torrents on his MBP when he's not around it too much? I don't want to hurt the display or HD or battery but I wanna download torrents like I do on my desktop...which insinuates leaving it all night long.
In the "System Preferences" pane you'll find a section called "Energy Saver". In there you can establish various settings, including keeping the computer "on" at all times, but putting the display to sleep when it is inactive.
Why use the applications you list? Mac OS already gives you the tools you need.
By the way, this isn't the best way to solicit help in what is otherwise a well-intentioned discussion forum. Asking for advice on how to go about pirating in the most effective manner will not elicit as my responses as you might hope. Whether or not that's your motive, in the future you might benefit from omitting all the specifics.