4,5,6. Auto ISO function in A-DEP, M, AV, TV, P mode / Customizable Shutter Speed and AEB value*To enable AutoISO go to "ISO speed" menu and press "print" button. Blue light - enabled, Red - disabled.
*To enable(disable) AEB go to "Drive mode" menu and press "print" button. Blue light - enabled, Red - disabled.Always go to menu, Picture Style, Select User Def. 3 and press jump for configuration as below.
** User Def. 3 Summary
Sharpness - next higher value for Minimum Shutter Speed
Contrast - Maximum Auto ISO value
Saturation - next higher value for Maximum Auto ISO (to set special ISO)
Color tone - Customizable AEB
AFTER CHANGES MADE, ALWAYS SWITCH TO TV or M MODE AND BACK TO AV or P MODE.** User Def. 3 SummarySharpness - next higher value for Minimum Shutter SpeedShutter Speed Range -
BULB, 30", 25", 20", 15", 13", 10", 8", 6", 5", 4", 3"2, 2"5, 2", 1"6, 1"3, 1", 0"8, 0"6, 0"5, 0"4, 0"3,
1/4, 1/5, 1/6, 1/8, 1/10, 1/13, 1/15, 1/20, 1/25, 1/30, 1/40, 1/50, 1/60, 1/80, 1/100, 1/125, 1/160, 1/200,
1/250, 1/320, 1/400, 1/500, 1/640, 1/800, 1/1000, 1/1250, 1/1600, 1/2000, 1/2500, 1/3200, 1/4000
The sharpness value in User Def. 3 is how many times program will increase lowest shutter speed to next higher value to calculate max shutter set point.
Example:
If minimum shutter is 100 and sharpness is 2 the max shutter will be 160.
If minimum shutter is 200 and sharpness is 2 the max shutter will be 320.
If minimum shutter is 400 and sharpness is 3 the max shutter will be 800.
* Minimum shutter speed can be set from Tv or M modes. Shutter speed in those modes will be minimum set point for Av and P (after switch from M or Tv to Av or P).NOTE: This is not working for me. I tried to refocus but it still goes below the minimum shutter if my ISO is too low for low light.
Technical reason:
AutoIso probably reacts on light changes too slow (have to pre-focus few times before it sets right speed). It gets current shutter speed value from LCD screen, which updates with delay and sometimes it will increase/decrease in steps. That's why AutoIso so slow. I can't find any better place to get current shutter speed from. Don't have enough knowledge in disassembly. If anybody know good resources about disassembly in arm feel free to send me a link. Thanks.
Contrast - Maximum Auto ISO value Contrast values - from -1 to 4
-1 = ISO 100
0 = ISO 200
1 = ISO 400
2 = ISO 800
3 = ISO 1600
4 = ISO 3200
Example 1: If Contrast value is -1 (ISO 100), the ISO will automatically change from 16 to 100.
Example 2: If Contrast value is 3 (ISO 1600), the ISO will automatically change from 16 to 1600.
Saturation - next higher value for Maximum Auto ISO (to set special ISO)Saturation value - from 0 to 4
ISO Range - 16, 32, 40, 50, 80, 100, 125, 160, 200, 250, 320, 400, 500, 640, 800, 1000, 1250, 1600, 2000, 2500, 3200
Example 1: If Contrast value is -1 (ISO 100), Saturation value is 1, the maximum ISO value is 125. (see ISO Range above)
Example 2: If Contrast value is 1 (ISO 400), Saturation value is 4, the maximum ISO value is 1000. (see ISO Range above)
Color tone - Customizable AEBColor tone value - from -4 to 4
-4 = +-2.3EV
-3 = +-2.7EV
-2 = +-3.0EV
-1 = +-3.3EV
0 = +-3.7EV
1 = +-4.0EV
2 = +-4.3EV
3 = +-4.7EV
4 = +-5.0EV
7. Factory MenuGo to menu, push "print" button, push "menu" button again twice, "Factory Menu" appears
Specific topic about Factory Menu in forum :
http://chdk.setepontos.com/index.php/topic,4171.0.html8. Focus Frame PatternFast press focus frame button twice to show FP dialog. (You must press the focus frame button fast enough)
If you hear a beep and the dialog showed, use "Direct Print" button to change pattern.
Press focus frame again to return to default canon focus frame mode.
*Note that external AF assist capability (via Speedlite or ST-E2) will not work with pattern AF modes. 9. Shutter CountGo to menu, push "print" button, push "menu" button again twice,
Enter Factory Menu in menu screen, push "print" button to enter "debug mode".
After a beep, go back and set spot metering. You will see the camera writing something to the CF (CF light).
Eject CF and insert into card reader, open STDOUT.txt. Press Ctrl + F to open "find toolbox" and type "Release". The number under Release is your shutter count.
10. Safety ShiftTo enable - go to "AF mode" and press print button.
Double red light - enabled, single red - disabled.
**AutoISO was removed from this bin. It was to slow to be usable.
KINDLY LET ME KNOW IF THERE'S ANY ADD-ON OR MISTAKE IN THE SUMMARY. I REALLY HOPE THIS HELPS THE COMMUNITY 
EDITED: Safety Shift
