Here are some things I’d do in the edit I’ll never get around to:

Remove Thomas Wayne swinging at Joe Chill

Remove bats making Bruce fly in dream

Cut some of Lex Jr.'s more ridiculous moments (Granny’s Peach Tea, general twitchyness)

Remove the Flash’s dream(?) message from the future

Trim down some blatant JL setup (cut away before videos are clicked on)

Remove weird slo-mo shot of Superman standing still rather than trying to find survivors in burning building

Remove some cameos of real people

Try to change the reason (if possible) for the titular fight to end (they stopped fighting because their moms have the same first names? Really?)

Remove Doomsday and unearned Death of Superman pseudo-adaptation entirely, Lex gets arrested for his crimes after Bats and Supes settle their differences.