New build:
Major rework of iso shortcuts. Cleaned out a lot of code. Should help with stabilty.
Wow...! I've been testing and it had to be a major rework because the feeling of confidence on a button when I press it is now x10

On a side note, I'm new to Magic Lantern and it took me a while to know what a button will do when I press it, but I have to admit that it was not until now that I understand how to configure it properly. Thanks to the fact that on gain there is no "aperture+ISO" option anymore, I realized that it was not related to the wheel selector! So I finally made my mental model:
UP-DOWN -> ISO adjust
RIGHT -> Switch between aperture and shutter speed when rotating the wheel (make sense that the one active, either aperture or shutter speed, is highlighted on a different color or grey out the other one a bit?)
LEFT -> Focus zoom
SET -> Crop mode when available (1080 and 5K) or something else
INFO -> False colors if live view available, or actual frame preview
Dual ISO is working 100% of the time and the new method is sooo much better. Sometimes it's better to preview with low ISO (most of the scene is well lit, but there are some shadow parts) and sometimes with high ISO (just a few highlights on the scene), and now it's a pleasure being able to decide that and have a perfect preview until you click the record button.
I didn't compare the behavior with previous versions in detail, but the feeling is much better (in part due to me realizing how it was supposed to work), awesome!
Note: I had to cleanup my old settings, otherwise weird things were happening
Note 2: I think there was another version with the same name (Danne you never thought you will release 2 versions in one day hahah) that was not working properly for me, just in case someone downloaded the one that was up for a few hours.