The CVT or in the case of any AT in any car made today will not let you do anything outside of the normal operating range. So yes you can put the car in MT mode it will pick the closest manual gear ratio for your current speed and then you must use the paddle shifters to change the gear ratios.
Keep in mind that when the CVT is in Automatic mode you can still use the shift paddles and the CVT will hold the manually selected gear you have shifted to till it picks up a change in throttle input then it will go back to full automatic mode.
Example while in Automatic mode you can down shift say to 3rd gear while going down a long hill to keep your speed checked - after you have hit the bottom and given the car some gas to keep your speed going the AT will drop back into D mode by its self.
If you selected Manual mode the car will stay in 3rd gear till you either put it into Automatic mode or you change the gear using the paddle shifters.
The only time I use manual mode is when I'm off roading and need to hold a specific gear, towing my boat up the boat ramp again need to hold a specific gear, Or while driving up a very long steep climb where I want the car just to hold one gear and not change it every time the throttle input changes slightly or the road incline changes a little etc.
Keep in mind that when the CVT is in Automatic mode you can still use the shift paddles and the CVT will hold the manually selected gear you have shifted to till it picks up a change in throttle input then it will go back to full automatic mode.
Example while in Automatic mode you can down shift say to 3rd gear while going down a long hill to keep your speed checked - after you have hit the bottom and given the car some gas to keep your speed going the AT will drop back into D mode by its self.
If you selected Manual mode the car will stay in 3rd gear till you either put it into Automatic mode or you change the gear using the paddle shifters.
The only time I use manual mode is when I'm off roading and need to hold a specific gear, towing my boat up the boat ramp again need to hold a specific gear, Or while driving up a very long steep climb where I want the car just to hold one gear and not change it every time the throttle input changes slightly or the road incline changes a little etc.