Britney wasn't fat during Femme Fatale era.
Anyways, I can't say that I'm here for the idea of Britney taking COMPLETE creative control of her albums. To be honest, her most commercial records happen to be my favorites. I love
Oops!...I Did It Again, Britney, Circus, and Femme Fatale more than an album like
In The Zone and the demos that were rumored to be on
Originall Doll were really not that good and left little to be desired for and I think it would of been catastrophic for Britney in terms of singles success with R&B and Urban-influenced music dominating the charts at the time.
If anything, her input in her work should be like
Blackout. She was the executive producer of the album and had a lot of input in terms of advice and direction for the record but left the producing and songwriting to the professionals (not that I would mind a Britney-written track on an album, but let's consider the fact that the last song she wrote for an album was My Baby and even though I personally like the song, fan reception to it was FAR from positive).
Now, what I do think Britney can easily have COMPLETE creative control over is her tours, music videos (except the directing of said music videos for reasons that I shall not dive into), the image/imagery she wants to have for the era, and the performances.
As far as choreography, the Mannequin choreo was pretty damn good so if she wants to choreograph her songs herself then I'm all for it. I'm sure she knows better than anyone else what she can and cannot do and what type of dancing suits her and feels the most comfortable doing.
x1000 Although I still can't believe you dislike ITZ. 
Baffles me why it's her highest selling album. Oops!...I Did It Again deserved ...Baby One More Time's sales.