I want to see Sephiroth deliver a Fastmateria Special straight into Cloud's diaphragm in the Shinra Mansion basement.
Fight with Palmer that involves using the Tiny Bronco somehow and does indeed end with him getting flattened by a truck.
The slapfight atop the Sister Ray obviously needs to be Tifa snapping Scarlet's spine.
Buugenhaagen floating around being 130 years old and having no legs.