Please add letterbox and other matt's like 2.39 etc. for head space reference
Please add a effect where we can add matts like 4:3 | 16:9 or 1.77 | 2:35 | 2:39 instead of using third party matts for our feature films to get the head space reference.

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From the team that built Productions:
You can make a label color change in the source project and whatever the label color is in the source project will be the same when you drag it into the timeline. But the connection is broken from that point onward, so if you change the label in the source project, it won’t update the timeline project; you can only update the label color in the timeline project (right click the clip in the timeline and change label).
If you right click on a clip in the timeline and select rename, it will open the source project and highlight the text field of the clip in the project panel. You can rename it from there, as long as you have read-write access, and it should update the projects you have opened that are in read/write mode.
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deelan sital commented
I second this. Having some sort of output blanking whereby you can have a selection of crop ratios or to be able to customise a bespoke crop ratio.
Perhaps having it outside the spectrum of adjustment layers or graphic files so it doesn't clutter your project.
Perhaps having it as on/off tool like toggle displays or overlays?
Leaving users free to rack footage freely. similarly to the OUTPUT BLANKING TOOL in Resolve for letterboxing.