My minimal requirements are
1. Posts created in Wordpres must be copied as new threads in Xenforo
2. Comments made via Wordpress are copied into proper Xenforo thread
3. Comments made via Xenforo are copied into proper Wordpress post comment
1. Any update on post on XF or WP is synced in both ways
2. Any update on comment on XF or WP is synced in both ways
3. User actions are synced between XF and WP.
4. User managment is synced between XF and WP.
I saw that a lot of people are looking/waiting for this so maybe you could try to add this in next version