okay, now i get why you want Amarok. i usually just play music on another machine, but i can see why you would want to add Amarok to BT.

to install more apps to BT, i would personally go with the bootable USB option (with persistant changes). i have a USB stick set up to boot BT with 3 partitions, for various uses, as follows:-

sda1 - vfat - used just to store files
sda2 - vfat - used for BT distro (bootable)
sda3 - ext2 - used for BT persistant changes

a problem that i have with BT, to which i am not sure there is a solution. is that i would like to boot into the persistant changes mode and make some changes (such as change the keyboard layout to GB etc). then i would like to be able to boot into one of the NON-persistant changes modes and have the changes that i made in the persistant changes mode applied, but have any further changes that i make, such as installing enhanced drivers, discarded when i reboot? if anyone has a solution to, or just any ideas about, this problem then i would be very grateful.