download package setup

[pathia]

I've installed the download package and while most parts work I do have some questions.
I am using an external usb disk so I decided to delete the download, incomplete and torrents directories from Xbian user's home directory and replaced them with a symlink to /media/usb/xxx.

* What is the preferred directory structure to start off with?
* How can XBMC automatically add my newly downloaded stuff to the library?
* Why does couchpotato uses torrents instead of instructing nzbget to download something?
* Why is nzbget download only at max rate of about 1 mbps ? When using torrents I have seen about 3 mbps in my mrtg graphs of the traffic. But this also is not exhausting my vdsl2+ connection which is about 27 mbps.