You can set you own shortcuts for the ribbon menu commands.
Click the Panels→Menu→
button group. The Edit Short Cuts dialog box shown below will appear.
Click on any of the column headers to sort by that column.
Right-click on a column header to show the context menu.
To set a command pick a key in the Key column/Check the control checkbox to require the CTRL key to be pressed, similarly check the Alt checkbox to require the Alt key to be pressed. (Note – It is possible to require both the CTRL and Alt keys to be required)
Below the Add Closed Curve has a shortcut assigned to it which is the 'D' key and the CTRL Key.
