I have a multi screen scene (3 video tracks on same screen). Is there a way I can lock the attributes of the 3 screens, specifically position and scale of each video track, so that no matter what scale or position a clip is, it will automatically comform to the locked attributes of the video track? Right now I have to copy the attributes and paste them to each video clip I drag in.
You could nest them and animate the nest. Select all the clips, right-click and select "Nest." This will create a new sequence, put the selected clips into it, and replace the clips in the original sequence with the nested sequence. You can animate it as you wish, then.