global profiling enable/disable

[eluser]ajsie[/eluser]
i read that you can disable and enable system profiling with:

$this->output->enable_profiler(BOOLEAN);

but why isn't this an option in config.php or somewhere else?

why do i have to put this in a controller?

it should be global like other configuration options?

now im force to always put this in a method if i want to disable it?