Several of the tricks listed on http://www.makeuseof.com/tag/10-youtube-url-tricks-you-should-know-about/ could be used as extra options for youtube integrations (be they a FieldType or a Custom tag):

• Infinite looping of the video
• Thumbnail URL
• Link to a GIF of the video

Bonus: playing two videos in sync, with timing options

These options could easily be assembled into a re-usable component as a bonus.