Well, I used a variable in the Registry class and then put
_debuggerUp = true;
inside the FlxGame constructor.
Then I just put
Registry.fps = uint(1 / (flashPlayerFramerate / 1000));
inside the update in perf.as and create a FlxText and update it with the registry information and voilá!
FPS on mobile without performance slowing alphas!
My ipod hates alphas.