As a caster, I would love to see some decent controls on the Spec mode.
So for example,
Space Bar could rise the camera like its on a crane.
Mouse wheel can speed up and slow down the speed of the camera movement
Maybe a shortcut key for a quick crash zoom.
Battlefield 4 has similar controls, should you need a reference.
Hopeful but unlikely wishes
To be able to save camera locations, for walk by's/cannon ball bys and such like
To be able to save the battle as a demo (CounterStrike style) so that you can play it back using the Engine, and that it records the movement of the players in said demo.
This feature would allow great flexibility with regards to recording events, as the camera man cant be everywhere and see everything.
Also it means that other players could record their own 1st or 3rd person demos and provide them to casters or film makers to allow them to record the action from the players POV
Hotkeys for jumping to Regiments or key points/Colours+Flag bearers
Be nice to be able to bind a key to do this. Maybe have it focus in the case of regiments on the highest rank player in said regiment still on the field.
Freecam option in Spectator
Hotkey/options to turn off all HUDS, player names so its possible to have a clean image. This will help film makers with not breaking immersion.
CannonBall cam? Has comedy potetial