Yes you can add another N/O module to that switch.
Please keep in mind that the switch as shown from your link comes with a N/O & a N/C module. The switch is a "Center Off" 3 position switch. The behavior of a N/C module with a "Center Off
" switch is somwhat difficult to handle with any wiring plan. You can remove the N/C module and add 2 (or 3)additional N/O modules to achieve what you want to do. No problem.
Here is a layout of the different types of "Center Off" switches with the connections shown in the selected positions. With the NC module, the center position has both of the N/C contacts closed.
Hope this helps.