Batch Manipulation in the VSE? I'm working with the video editing part of Blender, and I was wanting to change the proxy video settings on all of the videos in my project in the sequencer. But I had to go to each individual video to do so. It took up a lot of time. Is there a way to do it faster?
For some toggles, you can first select multiple strips, then right click on them and choose "Copy to Selected". 

For batch controls on proxy quality setting, there is a very nice VSE addon here, which can make it much easier.