-I'd say replacing ECW referees with WWE referees makes no sense in kayfabe or in business. Why not use the OVW referee crew instead? Fans won't recognize them like they'd recognize the SD! refs.
-I'd strongly recommend using ECW as the single-A brand for non-wrestling talents (referees, announcers, etc.) so they can get experience on TV with less pressure.
-Quietly dropping the 'ECW matches = no DQ' stipulation is a strictly business decision. As WWE learned five years ago, if you overuse hardcore weapons you devalue them and make them less important. Would the Edge-Foley match at WM22 have been as affecting if Al Snow was still hitting Raven with cookie sheets every week on TV? They make it clear that all of the 'important' matches are no-DQ, which are the only ones in which weapons have played a factor in ECW since 94.
-Also, I really think a lot of ECW's 'extreme-ness' can be retained simply by making some directorial touches. Instead of having Paul Heyman be in the generic GM-style office, why can't he have a desk in a bare locker room instead? Why can't all ECW promos be cut in the hallway or in the parking lot? You need to keep that underground image however you can, because a high-gloss ECW is an oxymoron.