We've never actually seen much of a mature Avatar. Aang only mastered the Avatar state at the end of the series, and Korra hasn't even bothered to perfect the four elements yet.
It's possible that they learn the secondary elements later in their lives. But we do know that Aang could redirect lightningh and bloodbend.
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Edited by lonepaul2441: 10/28/2013 1:18:13 PMSince when could he bloodbend? When he overcame the bloodbending in Korra's vison? No he used the Avatar state to overcome it by sheer power. Katara could overcome it at 1st by being a stronger water bender, same with Amon. Oh and redirecting lightning doesn't mean he can use it, Zuko learned to redirect it but didn't use it.