Since editing posts is something you want to keep track on (whether a user changed his/her words, or a mod/admin changed their words), I decided to post this as a bug and not a feature request.
Code is pretty easy, in /scripts/modifypost.inc.php just add:
admin_log("EDIT_POST", "<a href='" . make_ubb_url("ubb=showflat&Number=$Number#Post$Number", $Subject, false) . "' target='_blank'>$Subject</a>");
Somewhere near the end of the code.