Works fine on iAudio X5...
(Stands on soap box)
I REALLY wish some of you guys would try to better understand the importance of design. Not disrespecting the hard work you guys put into Rockbox, and I love my Rockboxed X5 to death, but I'm a designer by trade and it's frustrating to constantly hear the potshots you guys give to anything design-related. I personally don't feel good design is at all "useless eye candy," it's an important attention-grabbing element that many people appreciate.
To me, one of the biggest draws of Rockbox is the flexibility in designing WPS's (and I've designed several). Though trivial to you, improvements such as this "useless" slider patch can only make a better Rockbox, which is all we want!