Installing moderator-controlled mute buttons on the candidates microphones would eliminate interruptions and better control specified time allocations. When the allotted time expires your microphone is simply switched off. The candidate’s lip-synch and/or pantomime would fall on deaf ears to both opponent and viewers.
Such simple controls would be fair to both candidates and allow the moderator better control over the proceedings. We could install such controls easily before the next debate. Dontcha think?