So the question moreover is about placing a button or a pop-up menu in a toolbar, with which one can easily modify common attributes like TITLE, ALT, REL and so on with object-tags like IMG, A, and so forth. This should be instead of object's settings dialog-box.
btw, maybe someone knows how to modify CKFinder's Settings Pane to add some properties there also, which are working through the cookies (as I've found), letting saved settings be applied at all times.