No. Media Scheduler is a separate program that runs in the background. You can not schedule a recording in Theater view.
In Theater view you can start recording as you watch. You can switch to playing other things after recording is started (by using a different Zone). However, unless your zones are routed to different speakers, you will get both TV audio and the other audio out the same speakers. In other words you can not mute the TV audio when you start recording in Theater view (or any other view within MC).