One thing that no one has mentioned yet but would be really cool is the ability to use photo mode in third person while V is in a first person animation, by which I mean things like sitting cross-legged in a chair, leaning up against a wall or balcony, drinking whiskey at a bar table, etc.
Currently, this is only possible with the assistance of third person camera and photo mode mods, and therefore the current animation system would probably need a moderate-to-large overhaul that might put official support for this out of reach. However, I still think it would be fantastic to be able to take some third person shots of V sitting on the yacht with Kerry, leaning against a railing with Takemura, sitting across the table from Joshua Stephenson at PieZ, leaning against the windowsill with Judy in her apartment, or any number of other impactful scenes where photo mode is currently locked into first person due to technical limitations.