I like Pat Hingle alright, but I believe he was a bit miscast in the role of Gordon. But yes, I would have loved to have seen more of a relationship between him and Batman in the Burton films. As it seemed very casual at best in both final products.
Seeing Robin in a Burton film may have been interesting as well.
Also, I would have loved to seen the scene where Joker's goons take out Gotham's top tier gangsters which was in one of Hamm's first drafts.