Moving a page to another space should move the children

When I move a page to a new space, an option to also move all children (and update appropriate link) would be a big timesaver.

This would be a really useful option. I just spend 20 minutes moving a bunch of pages to a new space and re-creating the hierarchy by manually re-assigning all the parent/child relationships. With this feature, it would have taken 30 seconds...and be much less error-prone.