Here is my setting:
-A9LH: FIX94 fork (backlight sets at 0 at boot, no screen flashing, just a clean boot)
-AuReiNand, last version.
It is great really. I really wanted to use L+R to boot CTRBootManager but as backlight is set to 0, we cannot. (And this backlight sets to 0 is the only way to have a really "clean" boot with no flashing screen at boot.)
The main issue is that, because of this lack of backlight, we can't use L+R to boot into CTRBootManager, FIX94 made it really to use arm9select, that is great obviously but I wanted a menu to have more than one payload easily. (the way arm9select managed the payload allows a quick boot but it is named up/down/left/right/a/b, etc)
I slightly edit main.c in the source of arm9select, it does not check which buttons you are pressing to boot a payload.
I renamed it to arm9payload.bin and put it into the rei folder. It checks for two files in the rei folder: "backlight" and "menu.bin". (backlight is just a flag, menu.bin is CTRbootmanager9.)
It works well, I let this edit of FIX94's work here. (everything is really 100% his work, I did not remove ANYTHING except the fact that even if you press A/R/X/whatever, it will boot straight to menu.bin.)