Hmm, thanks! But I did that, installed whole custom settings apk and launched the custom settings and turned the backlight off in there too, but it's exactly the same. Also this rom already has backlight button setting in options, so it didn't do anything new as far as i can tell.
The key backlight turns on randomly after like 5-30sec of pressing on screen. It's not like the usual backlight turning on keypress but it turns on after some time instead.
Edit: Backlight keeps turning on even if i have the default 3sec deley. the backlight would turn off after 3 sec and then back on after like 10sec until screen turns off or i press again on screen. Weird, maybe rom bug? I cant post on rom thread because i don't have enough posts
Edit 2: OK I have linked it to screen brightness. Every time screen brightness changes (from adaptive lightning, screen timeout and app/game setting) the key backlight turns on. I have no idea how to force the key backlight to stay off though, so thats why im here :P