I can think of another unresolved detail - though you may have thought of it - the video may not line up between the theatrical and 04 discs. For instance the exact position of the movie on screen may not stretch all the way to both sides... in "patching" you may want to resize the video from one of the DVD's to match the other (it would also be good to give people a choice about which way to do this, for instance splicing the 04 disc into non-anamorphic resized to match the theatrical discs - or splicing theatrical disc into anamorphic resized to match the 04 disc). I only suggest this because if people are wanting to apply relatively "few" patches to the theatrical disc they may not want to have the rest of the theatrical disc re-encoded ... but those using the '04 disc as a base to be patched probably would want to resize the theatrical disc instead.