I understand that lines can be added with the use of a mouse to click the options you provided; however, this requires added steps to create invoices with dozens of lines.  In the past you could tab through the line and it would automatically start a new line.  This was effective for entering invoices with a lot of items.  Having to use the mouse to click for every new line is time consuming and ineffective.  Bring back the tab to add a new line feature!