>                       does somebody made an enhancement so that the explorer window acts as the
>                       window label of the inspector: showing the class of the inspected object.
>                       It would be cool if the class of root of the explorer or the selected items
>                       would be displayed in the window label.

attached change set displays the same title for the root object as the
inspector does

>                       Then does somebody introduced shortcut for the explorer?

apparently yes, use
(Ctrl|Alt|Meta|Cmd|Opt|whatever-your-platform-uses)-I to get the
explorer instead of -i for the inspector