How can I set a brake mode with move_voltage() commands?

My teammate and I have made the switch to using PROS for developing our programs. We decided we wanted to have a joystick curve such that our drive train does not jump to 100% speed (or in this case max voltage) and instead gradually approaches that max. To do this , we found that - at least in our experience - we had to move by voltage. We found this fine, until we realized that we could not use brake commands.

Our driver strongly prefers operating the robot with brake methods, so how can we go about resolving this issue? Here is our code in question:


void opcontrol() {

	// left side motor group
	pros::Motor leftMotorBack(3);
	pros::Motor leftMotorFront(8);
	pros::Motor_Group leftDriveSmart({leftMotorBack,leftMotorFront});
	
	// right side motor group
	pros::Motor rightMotorBack(4);
	pros::Motor rightMotorFront(7);
	pros::Motor_Group rightDriveSmart({rightMotorFront, rightMotorBack});

	// controller initialization 
	pros::Controller master(pros::E_CONTROLLER_MASTER);

	// parse input from controller - arcade driving method
	float acceleration;
	float timeElapsed = 0;
	while (true) {

		// grab input from controller
		float rightInputX = master.get_analog(ANALOG_RIGHT_X);
		float leftInputY = master.get_analog(ANALOG_LEFT_Y);

		// detect if leftInputY is forward
		if (leftInputY > 100) {
			timeElapsed = timeElapsed + 0.55;
		} else if (rightInputX < -100) {
			timeElapsed = -(timeElapsed + 0.55);
		} else {
			timeElapsed = 0;
		}

		// detect if rightInputY is backwards
		

		// adjust acceleration
		acceleration = -pow((timeElapsed-5),2)+25;

		// control wheels
		float left = acceleration + rightInputX * 40;
		float right = acceleration - rightInputX * 40;
		leftDriveSmart.move_voltage(left);
		rightDriveSmart.move_voltage(-right);

		// set voltage to 0 when -5 < joystick < 5
		if ((master.get_analog(ANALOG_LEFT_Y)) > -5 && (master.get_analog(ANALOG_LEFT_Y)) < 5) {
			leftDriveSmart.move_velocity(0);
			rightDriveSmart.move_velocity(0);
		}


		// prevent system from overworking
		pros::delay(2);
	}
}

Here is the motor group API, specifically the function for setting the brake mode. Motor Groups C++ API — PROS for V5 3.8.0 documentation