Often there is a need to play a successive combination of layers.
For example “Start Show”: the starting video, with the output to the main camera + titles + sound jingle + news crawl
OR “Show end”: finishing video + scrolling credits + news crawl + breaking news
Would be an interesting implementation: a layer is created - where from the drop-down lists it was possible to compose a playlist of existing layer variants with the ability to select “simultaneously”, “sequentially”, with a “delay in sec”
This will give you the ability to create prepared sets of advertising, referrals to rubrics, and similar opportunities