Develop Module RGB Pixel values: 0-100% or 0-255.  Let the user choose.

I know that folks differ on whether they prefer to see RGB pixel values represented as integers in the range of 0-255 or floating point numbers between 0 and 100%.  Is there a way that the user can choose which one he/she wants (perhaps in the preferences)?  0-255 makes no sense for images which are >24 bit depth or in other color spaces.  It would be nice to have the "luddite option" (0-255) and the "future proof" option (0-100% or whatever range makes sense given the color space).  :-)

rI load a raw image of Macbeth colorchecker. I look at the RGB percentages for one of the patches. What are they percentages of? I cycle though the colorsapces with Edit/Preferences/External Editing and nothing changes. The RGB precentages remain the same. They are not dependent on the "external editing" colorspace.
As you discovered, the "external editing" preference is not used inside Lightroom. It sets the color space of the file that gets generated when you do an "edit in Photoshop". Lightroom uses a unique colorspace that has prophotoRGB primaries. Internally all math is done in a linear gamma version of prophotoRGB called MelissaRGB inside Adobe. The values reported under the histogram are based on melissaRGB but modified by the sRGB tone curve. There is nothing equivalent to it in any other piece of software, so you simply cannot compare Lightroom values to values in any other peice of software, regardless of the color space. Andrew wrote a nice overview on this many years ago: http://www.ppmag.com/reviews/200701_rodneycm.pdf 
I go to Soft Proofing and the RGB values change to numeric. I cycle through some output profiles and the RGB values change, as I would expect. But when I turn soft proofing off, the RGB precentage values return and are the same. They do not depend on the Soft Proof profile. And in soft proof I only see 1 set of values, not a pair of values like Photohobby said. What am I missing?
If you turn off soft proofing, the values simply return to the actual values according to the internal representation of the image, not the soft proofed ones. What did you expect would happen? I've never seen pairs of values so I am not sure what that is about.
So, it looks like the Lightroom 4 RGB percentages are based on the Adobe98 colorspace, and are not dependent on any other settings?
As said above, the values are not comparable. the colorspace is prophotoRGB with an sRGB tone curve. If you're looking for colorchecker values in the Lightroom system: check here.
When I search the web for "skin tone by the numbers" I get hundreds of CMYK answers. I've never seen an RGB method. Please write one for us.
You really do not want to do this weird by numbers thing. This is largely a thing of the past. With modern color management and display calibration all you need to do is make the skin tone look good on your display and your output will be good. The simplest and quickest thing to do is to use a reference image with known good skin tones and put it up next to your image. Then adjust white balance until your own image looks good visually. Even better is simply to start with a known neutral by shooting a grey card or color checker neutral patch in the same lighting condition. This ensures good skin tone rendering if your development is not too extreme.

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