Though I despise Jar Jar and the prequels, this is actually an interesting idea. It would be a movie for little kids, set in the SW universe, but not connected to the main saga in any way, kind of like those Ewok TV-movies (Caravan of Courage and Battle for Endor).

I was watching some RLM thing recently (can't remember if it was Half in the Bag or the TPM 3D commentary), and they talked about how JJ was the only character in TPM to actually have a character arc.

Maybe the movie really was supposed to be about JJ? In the TPM webisodes and the "making-of" documentary, Lucas does say, "Jar Jar is the key to all of this..."

On a side note, I think JJ wouldn't have been nearly as annoying if he simply had a different VOICE. That's probably the most irritating thing about him.