propset value for custom WB

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Hi,
I was looking for the custom WB propset, it was easy to find.

First, this is how to look for it:

1 Load firmware as usual
Play, menu, load firmware

2 Go to shooting mode, if you want to investigate changes there
Shooting mode (press shoot)

3 You have to turn off the help screen, so you can see the debug display
Note: this is what I mean by the help menu, it looks like this:
------
<ALT> Shortcuts MENU=CHDK Menu
SET=Script Menu, SHUTTER=Run Script
--------
Enter CHDK
press ALT
MENU
CHDK Settings->MENU Settings
Show <ALT> Help Screen (press SET here to deselect)

4 Set up the debug shortcut
Misc->Debug
ALT +- Debug action: CmpProp
MENU
ALT

5 Make your changes
change custom WB in normal Canon menus

6 View the changed propsets
ALT
ERASE (think this was what is meant by +/- key, on SX50)
Something in yellow appears

This is what I found, for SX50 (propset 5),
274 signed byte, value of horizontal B/A axis for custom WB modifier
1=A1 setting, 255=B1
275 signed byte, value of vertical G/M axis
1=G1, 255=M1

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Question, how to read/set this in lua script?
Also, how can I read the RGB gain values, which appear as a tag in .cr2 files?

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