Multiple simultaneous zoom levels with a multi-timeline representation (a.k.a. "cutting mode")
While researching Davinci Resolve a bit to try to understand the logic between their various UI modes, I stumbled upon this video that explains very well the timeline representation feature they added in version 16, so I recommend watching it: https://www.youtube.com/watch?v=_5U00UYhXDk
It's meant to speed up the most tedious process of video editing: initial cutting and structuring of the global timeline, by offering a second (and third) timeline representation above the timeline, that is always zoom-fitted to represent the whole project timeline, lets you insert/reorder/trim/cut things without zooming in and out all the time, and lets you keep your context and precision with synchronized timelines/playheads, and j/k/l trimming. It seems to be a big deal for editors coming from a traditional pro editing workflow, so it could be an interesting feature to replicate in Pitivi. Just filing it here so that it can be on the wishlist (maybe a gsoc or hackfest project...)