I've always found level 4 to be perfect. At any rate, I wish there was a way to specify the _range_ of brightness, and then have the auto-brightness adjustments range between this. And then, ideally, there would be the option to set any number of levels, each with any range.

That would make more sense, in my opinion, from an end-user convenience+freedom perspective. Is that actually doable with current MCE (without the CPU cost of a seperate program doing the monitoring and and adjusting, and having MCE just not touch the screen brightness, as that's a less than optimal hack).