I enjoyed this feature back when I used a custom build (many moons ago), but it turns out accessing the current playlist with the official builds is nearly as easy. From the WPS, you just need to:
- Hold the center button for a moment, then click the center button twice. That's it. No need to even read the menus while you're doing this.
I realize 3 key presses aren't quite as simple as 1, but since it's the same button the whole time, this operation can easily become second nature. I hope that helps!