When using the spectator script a small box with the controls is shown in the lower right area. While providing the basic commands, this box doesn't hint the two buttons for faster camera movement. The missing information about the "shift" key to speed up the movement might be obvious to most players, but using the alt- key for an even faster camera movement (with approximately the speed one is used to from the zeus or eden perspective) is far less self-evident and leads to a worse user experience.