I'd like a feature where we can offer to share our saved instance information with defined friends. With a bunch of mythics to do with many alts, it'd be nice to know who has done what to help coordinate.

+1
It would also help to sync multiple accounts. Of course both characters would need to be online at the same time for data to be shared.

that's a no from me

Would love a similar feature to view my other characters on different sub-accounts but under the same battle net .