1) Hire Paige Turco as a regular and have Reese and her work cases as a team
2) Get rid of the Detective Fusco character (Kevin Chapman) and have Detective Carter (Taraji P. Henson) become the NYPD point person, sort of like Commissioner Gordon on Batman (see below)
3) Cast a younger actor and a younger actress to complete the team, so we can have one team following the perp and another team seeking evidence from another perspective
4) Turn the show into a full-on non-costume version of Batman and start developing recurring characters who become a rogue of villians for Reese and Finch (Enrico Colantoni was a good start as a version of The Joker, and I think Anne Parisse could turn into Reese's Catwoman)