When creating a new user, the log registered doesn't include the id of the newly created user,
I suggest to use the Info field to store this information.
In attach I provide a new version of the 'user/editadvanced.php' file that could offer this minor enhancement: it is based on the movement of the line

add_to_log($course->id, 'user', 'update', "view.php?id=$user->id&course=$course->id", '');

from line 80 to line 104 (with the use of the variable $usernew->id for memorizing the new user's id)

add_to_log($course->id, 'user', 'update', "view.php?id=$user->id&course=$course->id", $usernew->id);