I believe somebody posted about a fireworks seating package at the Main Street train station. Wish I could remember which thread it's in, but maybe someone will recall or you could call Disney reservations and inquire.
If you take the "A Walk in Walt's Footsteps" tour and ask for the latest tour (leaving at 5pm, I believe) priority seating is included. Keep in mind that you will be on your feet for 3 hours prior, but that is the only way to get reserved seating for the fireworks right now.
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