Hello there!
I would really like to be able to have multiple aspect ratios in one video, for example, the first part of my video is in 16:9 and the second in 4:3, it would be a new mode in the projects aspect ratio menu called fluid ratio or changeable ratio or something like that where the aspect raion isn't fixed but changes every time it detects different aspect ratio of the videos imported. I know some famous directors like Christopher Nolan are using this so why not make it a normal thing. It would make our life that much more creative, and without black lines. Thank You very much!