The LX100 has some decent controls for WB...
01) the normal selections for standard lighting conditions (including AWB)
02) Custom WB where you shoot a white target (subject) when the light changes
03) Ability to store four (4) preset custom white balance settings (think about the most common locations)
04) Perform White Balance fine adjustments. White Balance settings can be individually fine-tuned if colours still do not appear as anticipated.
05) Bracket recording using White Balance. Bracket settings are performed based on the fine adjustment values for White Balance, and three pictures with different coloring are automatically recorded when the shutter button is pressed once.
Page 103-106 of Panasonic
Operating Instructions for advanced features
Digital Camera Model No. DMC-LX100
(SQW0024 / M0914KZ0)
DMC-LX100EB_eng_full.pdf / 9.14 MB file size
_____________________
I agree with most of your "rejection" list. The one exception is the Fuji X100T. I am using that camera and the plus points are (a) the image quality / in camera color is very good, (b) I really like the face detection feature, and (c) if you shoot large JPGs the quality is good enough to crop to equivalent zoom. On the down side the X100T is maybe a bit too large for the purse.
You have a reasonable requirements list... My short list included the Fuji X100T and Panasonic LX100. Obviously the X100T won out in my case...
_____________________
Re: Nikon s9900. The small sampling of review sites (e.g. DPR etc) gave it 3.75-4.0 out of 5 stars and it does cost less than USD 300... My gut feeling is that, based on your requirements, the LX100 might be a better choice than the Coolpix...
Casey
This message has been edited by cshimokita on 2015-11-30 15:24:02