Peter,
The Artwork directory is used as a Cache that is used in various situations
throughout the iTSfv usage. It is not possible to turn this off because of
this reason. As a workaround you could redirect this folder to a hidden
temporary folder. For the next major version of iTSfv I will look into how
this could be minimized. Saving artwork temporarily to somewhere in the HDD
is vital for many artwork operations in iTSfv so instead of saving this to a
hidden folder I figured I might as well save it in a visible/accessible
folder.