I've just tried to disable a tuner via tuner setup.
The option doesn't appear to be there anymore.
I've tried simple_1080 and Vix-night-hd skins.
Tuner type can be changed to disabled, but when I reboot it's back enabled again, although tuner setup says it's disabled.
Have I lost the plot?
I'll reflash tomorrow if nobody else is seeing this.
Edit: What does configuration mode do? I can't check at the moment as recordings are in progress.