General Apps to lower brightness, control permissions and block ads.

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http://androidforums.com – I have a rooted Nexus 7 wifi running JB 4.2.1. I'm looking for an app that can lower the screen brightness lower than the factory settings. I'm looking to extend my battery life and my screen is still plenty bright when set at its lowest point. I've tried RootDim but it doesn't work. I'm also looking for an app that can block or control permissions. I realize this may break an app but as long as it doesn't mess something up I'm willing to give it a try. Also, what is your favorite ad blocker and why do you prefer it over other blockers? (General)