Improved White Balance Picker

I use the white balance picker (eyedropper) a lot, but it is often inconsistent, and it could be smarter.

What bothers me is this (in the user guide of it this is step 3):
"Repeat the selection until you are satisfied with the result."
The problem is that even in a neutral area every pixel is more or less different colour, due to sensor noise. Now the tool registers the value of a single pixel, and I get a different result for every click and I can't be sure which one is the most neutral setting. It is frustrating.

I think the tool should work like this:
- You can drag from one point to another, and the tool selects a circular area (like when I'm drawing a mask). Then the average colour value of the area is calclulated and that is used for determining the white balance. Now you would have like hundreds of pixels counted in and colour noise would not be a problem. Consistent results every time.
- If you simply click on a pixel it would work like before.

I posted this same comment in the user guide, and I have proposed this by mail maybe two years ago, but haven't seen it implemented so far. I think this is a significant issue, because white balance is one of the first things to do for almost every editing task, and improving this interface would make things quicker and nicer.

PS. I just stumbled over an archived, three year old thread about similar subject titled "While balance picker size". It discusses about the same, or partly same issue. The writer talks about areas with ares with different shades, but the same problem comes up with "plain" areas too, as there is always some noise spoiling things.

Someone asked "why not use the picker and then fine tune by eye?" Well, because I want to let the system calculate the actual neutral tone and not trust my fuzzy eye. :)

I'd just want a simple circle tool to choose an area, no extra settings. The idea presented here would enable that, but would work exactly like the current picker if you just click on a point.