AddCursorAtLineEnd only works when text is selected

The AddCursorAtLineEnd (Alt+Shift+I) works well when multiple lines of text is selected. It would be nice and consistend if it also work in other scenarios, like

• text selected in single line
• one cursor mode without selection
• multi cursor mode but when not all of cursors are at the line end

What is more in current implementation the cursor doesn't appear at the last selected line ending.