I just ordered a strange new toy. I ordered an 
audio fader to use with Lightroom.  While I love Lightroom, I've been frustrated for years with the slider panel. I often wondered if I could rig up something better using a dedicated hardware device for controlling the settings. I final started to research ideas and found that someone had already solved my problem.
 
There is a software package called 
PADDY for Lightroom that lets you assign keys to sliders in lightroom. Even better, they've worked out integration with MIDI controllers.  So, in theory, I can hook up the device pictured below and use the sliders and knobs to adjust settings in Lightroom.
 
 
Here is 
a YouTube video showing the process in action.
 
I'll let you know how it works when I get it all hooked up this weekend.  The software is free and the mixer is available at 
B&H for $160.  I watched them on eBay for a while, but they all seemed to be selling for $120 or so there.