I add images to event citations as proof of the event, such as a baptism certificate image which proves the date and place of the baptism.
I have asked Nick Hall to add these images to the Combined View Album tab but would like to suggest that the Timeline buttons, which currently have no specific function, could indicate the presents of an image attached to an event, by a change of colour or shade. Selecting the button, with the mouse would then provide a list of the images associated with that event allowing them to be selected and displayed in the default image viewer.
I don’t know if it is possible but it would be a use for the timeline buttons.