we noticed that the plugin does not stop other players playing on the website and would like this to be added hopefully very soon in one of the next plugin versions. Ideally you would upgrade the used vimeo javascript to https://player.vimeo.com/api/player.js (https://developer.vimeo.com/player/sdk/basics) - right now you are still running on the no longer supported Froogaloop Vimeo js api.

If it is not possible to upgrade the js to a contemporary and supported version, we would like to ask you to use at least ids on the iframes and to include the player_id= url parameter in the iframe src, as described in this answer: https://stackoverflow.com/a/6537832/2776727 - other wise the play events are not triggered.