"Auto scale" option for video/image strips

Hello! My name is Konstantin Dmitriev, I am heading a Morevna Project animation studio, where we produce short open-movies using FLOSS software. We edit our animation projects in Blender’s video sequence editor and we’ve faced a problem with recent versions.

At the first stage of our production we build a draft of the project and render scenes at low resolution (i.e. 480x270 or 960x540). We compose those scenes together in the video sequence editor. Then, when the project is ready, we re-render the shots at final resolution - 1920x1080 (we use automation scripts for re-rendering).

In Blender 2.79, 2.8x, we had no problems with this approach - the videos were automatically upscaled to fit the project preferences.

But starting from version 2.9, the behavior of Blender has changed: now, when we insert low-res shots, we have to manually enter transformation parameters to scale each scene to the project resolution. And when we re-render in high resolution, we have to tweak the scale to its original state again.

So, I would like to propose the following feature: Please consider adding an "Auto Scale" checkbox as a parameter for video/image strips. This option tells Blender to automatically fit (scale) inserted videos to the resolution specified in the project.