To customize key options: Tools -> Add-ons... -> Key -> Options...
Let's add to "Ctrl+E" in the list view. (open the selected item by an editor.)
Choose Tools -> Add-ons.
Click "Options..." of the key. You can search it by string with a left bottom input field, or Ctrl+F.
At first set the effective place of the key.
Choose the list this time.
- All: It is effective anywhere.
- List: It is effective in the list view.
- Tree: It is effective in the tree view.
- Browser: It is effective in the address bar, tool bar or etc.
Click the "Input" button to open the input dialog box.
When the input dialog box is displayed, hold down the "Ctrl" on your keyboard to press the "E".
It is input in a key column with "Ctrl+E", push "OK" with the mouse.
Change the type to "Selected items"
Click the "Reference..." button, then choose "Open with..."
Choose an editor, then click the "Open" button.
Click the "Add" button to add a set of "Ctrl+E".
Click the "OK" button.
Click the "OK" button to be completed.