Thanks for your post! Could you clarify what you mean by turns and shift in your request? We are using the default RPG Maker battle system for the Demo Project, so it should end your turn when you hit the End Turn Button or when you have played a card with the <willEndTurn> Skill notetag.
Yeah, that should be possible by giving your cards the <willEndTurn> notetag. That will restrict their play to one card per turn. You can also change the Battle Start and Turn Start plugin parameters to modify how Cards are drawn from the Deck to match the style you are going for.