It works. I don't like to change too much in the original firmware, so I removed all the patches except this one. Now I can set the slider roughly to where I want it, and then fine tune the setting. (Normally I'm between 10-15%, but on a bright, but overcast day, I might sometimes go up to 25-ish, I've noticed.)
Now I can set the KA1 front-light to blend with the ambient light, just as I did with the KPW1.
Thanks
I'll be saving 8432 and this patch, so I can return to this firmware if I don't like a future one for some reason.