I would like to see the grid allow the adding of a new row via the keyboard when batch editing. When the user is on the last row and last cell they can hit tab and the grid will add a new record and with focus on the first editable cell. Or the user can hit enter anywhere on the last row to create a new row. This would allow for rapid entry of several new rows of data. It would allow the user to key in data in a similar way a spreadsheet like Excel would behave.
Yeah perhaps a [Ctrl]+[+] combination or something like that anywhere on the grid can add a new row, with focus in first cell of new row.
Currently, only tab key can change focus to next cell. and tab key cannot add row as you said. So there should be an option in grid for assigning a special key (tab, enter, space, arrow keys, ...) to do this navigation and in case we are in last cell of last row, create new row. Some users want to enter a large volume of data and they only work with numpad keys, as there is no tab button in numpad keys, they want to use enter key to navigate and adding new row.