I am not sure about your radio (but I am gonna put my 2¢ in anyway).

When I installed flaps with my JR, and four servos in the wing, I had to have a servo reverser for the flaps. I really had to read the manual to figure out what wing setup I needed, because I wanted the crow setup also. Check your manual again for various wing setups. On mine, the different wings worked the servos very differently. I had to remove the control horn from the servo to keep from pushing the control surface past its limits.

The on/off engines could be two things. First, most gliders are either on or off, since the motor is just used to get the plane to altitude so the quicker the better so no need for a throttle control, just full on power. Second, if you have a speed control connected, then you may need to play with your throttle travel.

I hope this helps at least some :-)