I have been working with scripting repetitive tasks in Premiere. Many of our projects require making many iterations of the same idea. The scripts add graphics as needed. A given project might have 30+ sequences which we then need to go back through and apply transitions to these graphics. This seems like a no brainer. Loop through all the items on a specific track and apply the default transition. But it's not available. I can script opacity handles which works quite well, but in many cases, it would be easier to use the default transition as there's a visual indicator to the editor why something is happening to the video.

Scripting example:
app.project.sequences[index].videoTracks[index].clips[index].setDefaultTransition
app.project.sequences[index].audioTracks[index].clips[index].setDefaultTransition