In testing I have found 2 problems. It could just be me? I did test on my nexus 7 with the same result so it not just 4.1.1
1) "Previous" and "Next" under "Media Control" cause a double click (press) action when using Poweramp. It fully skips the next song and goes to the next one after that.
2) I am using Tasker however no shortcuts appear when I try to select one. Maybe I am doing something wrong here?
Everything else works perfectly!