"Enable autoplay" starts from the first slide instead of the current one
In presentation content type, adding an audio and selecting "Enable autoplay" make the sound starts from the very first slide instead of the current one in which the audio is placed.
An other usefull option would be an "Automatically switch to the next slide when audio ends".
Alternativly (and maybe better) the "add audio" feature could be joined by an "add narration" feature that adds this two options (autoplay and autonext) by default and place audio controls at the bottom of the slide.
I am playing with audio, but I guess the same could be said for embedded videos.