Hi,
Yes, the tuner definitely loses power whenever you switch away from it.
I've had a look at the current image and these files seem to have been moved to new places.
The module option config file (something.conf) now has to go into the /etc/modprobe.d folder.
Once I'd done this though I got the following error in the logs.
>> dvb: unknown parameter 'lnb_power_off_in_standby' ignored
So it seems that the parameter name has changed