The desired backlight level depends on the amount of light coming in from
the environment, not on the application that is run. Setting the brightness
when launching an application discards what is probably the right value
for this location (indoor/outdoor) and time of day. So we decided that this
is not a desirable feature and therefore removed it.
Although exposing a read/write reference to a private field is not much better than having a public field.
Well, at least we are explicit about the nasty stuff now.
