Adjusting Black (K) while in RGB mode?

Ok, so basically I'm wokring on an image in RGB mode, and I have my INFO box open, and I have the sample picker #1 and #2 set to display CMYK values.
I'm not sure if many people realize that even if you're in RGB mode you can actually view other color information, including CMYK, within the INFO Box. If you click on the little Eye Dropper icons located within the INFO Box, it allows you to choose between different color info to be displayed, i.e. LAB, HSB, Grayscale, RGB, CMYK, etc, regardless of the color mode you're actually in.
So I'm working on an RGB image, but I'm viewing the color info in CMYK, and my question is how do I directly adjust the K, or black, wihtin an RGB image, if I don't actually have the Black Channel available while I'm using Curves or Levels for example?
I tried using the 'Brightness and Contrast' adjustment, but it affects everything else as well, not just the K/Black.

I'm not really trying to affect the 'Black Channel,' I know it's confusing. In fact, technically, there is no Black Channel to speak of, because I am in fact in RGB mode.
Basically I was just trying to increase K, Black, in the INFO Box, from 0 to 4, under the #2 sampler, without affecting CMY. Because my INFO Box, is set to read CMYK values, but I am still in RGB mode. So I'm not really trying to affect the Black Channel, I'm just trying to affect what's being read as Black, while I'm still in RGB mode.
Right now, it's reading C=11, M=42, Y=51, K=0, and I wanted to change K to 4 without affecting the other colors, without affecting C, M and Y.
I just wanted to see if that was at all possible.
I don't think using another color profile is the path I want to go down. Right now I'm just using the standard sRGB.
I actually had to look up GCR, grey component replacement, and I don't think that's what I'm looking for either.
I just want to make a move in Photoshop that would accomplish changing the Black readout from 0 to 4 with out affecting CMY, or at least minimally affecting CMY.
But I guess it's not really possible at all, using the adjustments and/or the blend modes? I've tried a couple of things and nothing seems to work really.

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Re: F.E.A.R. 2 black screen while using Soundblaster X-Fi?
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