Caption duplicates don't update
If you duplicate a caption layer and place it on a new timeline, any updates and changes to that file don't appear unless you quit and restart premiere. I often have multiple variants of videos with only slight changes to the captions. It would save me a ton of time not to have to make new captions for each sequence.
Also, the caption style (font, size, background) should automatically keep to the last settings used and not default to Helvetica.