In the Sportage HEV, the paddles are used for gear shifting. The charging process is mostly automated; however, using lift and coast techniques together with moderate braking may enhance battery recharging. When a route is programmed in the satellite navigation system, you may intermittently get a 'Coast' notification on the dashboard, prompting you to pull off the accelerator and coast.
The PHEV may use the paddles for regenerative braking. A owner of a Sportage PHEV may verify.