Keep current authors IP address when others edit the node

Ref. the following issues raised by yngens in the issue queues of Comment_mover module and IP2country module:

"Keep original posters IP address on move"
http://drupal.org/node/11746

"Author's IP changes to admin's one when editing and saving nodes"
http://drupal.org/node/122105

From the description in the latter:

"(...) it becomes very uncomfortable for admins to edit anything. Because every time they edit any node or comment IP address of the initial poster changes to the one of editing admin. And what is terrible this is seen by the users and they are often confused about which country that or another user.

I strongly believe that core node module has to be changed in the way when the firsts posters IP never changes or changes only the post has been reassigned to another user. Simple editing of any node or comment by administrator should not change the initial posters IP."

If this is still how Drupal core handles IP addresses in D7, this should undergo a reconsideration.