I really like this idea. Decrease the emphasis on the ridiculous antics of the CG drivers and crashes, and instead cut it around Qui-Gon's reactions to the powers of the chosen one. It will still be a brilliant action piece, of course, but including Qui-Gon more makes it relevant to the rest of the story. I like the idea to extend the ending as well.
I'll comment on this new chunk of script when I get time...