Allow effects to be applied to a whole video track. Not just a clip or adjustment layer. Something that allows the effect to be applied to every clip on that track, and not every single track below it.

I’m working on a split screen project right now and it is unreasonably difficult. I’m dealing with a lot of clips, so it’s very time consuming to apply a crop and reposition each one.

I can’t nest my footage because each screen is interacting with the others, so I need all my clips on one timeline. No time to switch back and forth between 4 nested sequences.

An adjustment layer with a crop effect doesn’t work because it crops everything below it, and I need 4 independent visible screens.

Track mattes don’t work because they move when I reposition my footage. (By the way, this is ridiculous. Why don’t track mattes in premiere behave the way they would in after effects?)

It occurred to me that if I could just apply a crop effect to each track, it would save me tons of time and headache. I could then just reposition my footage within the “frame” the track is cropped to. It would also significantly streamline my timeline cutting down the number of video tracks I need.

This feature would also be helpful for a million other use cases. The first thing that comes to mind is coloring. When you have footage from different sources they need different grades. Usually this turns into a really messy timeline with lots of snipets of adjustment layers. But if you can put all your footage from one source on the same track and apply a grade to that track, it would save a ton of time.