Auto-fill for connection fields?

Yes, I plan to enhance the ‘fields’ API with all kind of goodies, ‘default’ being one of them.

If you’d like to contribute, see https://github.com/scribu/wp-posts-to-posts/issues/6

Awesome. I wish I had the coding skills to lend a hand (I’m more of a graphic artist). I’ll try to catch up on my php.