just found a 2 litle things after running
_ToolBarReset in V6 in the “New in V6” ToolBar:
The button “Select sub curve” is just running
_SubCrv which is the same as in “Curve Tools”.
The button “Select control point region” has a RMB command “Close object direction display” which makes no sense at this point, it is present already with the “Show object direction” button.