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.
Push "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 listview.
- Tree: It is effective in the treeview.
- Browser: It is effective in the address bar, tool bar or etc.
Push the "Input" button.
When the input dialog 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"
Press "Reference..." and choose "Open with..."
Choose an editor and press "Open".
Add a set of "Ctrl+E" by clicking the "Add"