The ability to change
font, color, mouse over image/color
sound(when either spinning, or starting an app/picture/folder/etc)
and able to turn off sound for either or.
able to change the color of the items inside slider.(meaning the background color, or even allow applying of a users own colors/images/etc.)
allow users to move the text location of the information mouseover.
add an option that lets users delete everything in the slider,
also you should think about making it a little faster,
it freezes up on item deletion.
but overall, the most implement thing you need to implement,
is the ability for customization.
and maybe even throwing in user modifications.
both will help greatly.