These aren’t missing or problems - just some ideas that might make day-to-day using SA easier.
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Some software has a Control - D to duplicate an element.
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A quick visual way to identify that there are multiple timelines in a publication. Maybe a panel listing them like with elements.
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Preview in a specific browser rather than default one.
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Modifier key to lock scaling of object when drag resizing.
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A comments / notes feature for scenes for keeping track of scene development and passing info to team / clients.