if there is a tickbox to re-open after rebuild, then this should be defaulted ticked, so that less experienced admins do not forget to re-open the forums.

I would also like to see a rebuild for signatures that should comply with current rules, as currently if new rules are implemented existing users are exempt from those rules (until they come to change them).

However avatars could perhaps not be removed if the user is no longer permitted them. We do not wish to upset too many users LOL

My reasoning here is that we have some users with very large images in their signatures. We have restricted this to paying members only. However those that already have this are still showing such large images. I would prefer this to revert to the code only being shown.

This could be handled by a content rebuilder.

Not too sure how you would tell pre 7.x posts/topics - these are not identified to my knowledge.