Having a bar that limits the record parameters
In music sequences programs, there is generally a bar that you control for record in and out. So, for instance, if you just wanted to record something for .5 seconds, it would do that only and you don't have to go back and change all the little things that have been recorded past that time. For one character these little things can be 10-15 bars you have to adjust. I could send a picture of an example, but I don't think there is that capability here.

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Daniel Ramirez commented
And to clarify, are you wanting this predefined range to work more like keyframing(drag hand from here to here over this time range), or more like a music application's punch in/out(start playback and only record during the predefined range selection)?
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Daniel Ramirez commented
This feature would be a good prerequisite for your feature request: https://adobe-video.uservoice.com/forums/911317-character-animator/suggestions/34043194-work-area
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Alan Kent commented
Is this another way to achieve https://adobe-video.uservoice.com/forums/911317-character-animator/suggestions/33842710-control-start-and-end-record-time-for-a-scene? (In this request its a request to set the in/out points, but allows takes to extend beyond the start end. So you can create a scene per “bar” and know that making extra recordings won’t mess up the duration of the scene.)