Set the machine for the regular white rice cycle and start.
When the machine switches to keep warm, let it sit and steam for 10 minutes.
While the rice steams, heat the olive oil in a small skillet, then add the onions and cook for 5 minutes, stirring frequently, until soft.
Add the pine nuts and cook, stirring constantly until they turn golden (just a minute or so).
When the 10 minutes of steaming are up, add the onion and pine nut mixture to the rice, along with the lemon juice, dill, and mint (if using). Stir with a plastic rice paddle or a wooden spoon to combine.
Close the cover and continue on 'keep warm' for 10 more minutes.
Transfer the rice to a serving dish, and top with the feta and lemon wedges.