I have used the 7ch sx on three full house gliders and a bunch of other stuff including EP 3D and scale gliders and the radio does it all quite easily. However, it does give you a very 'hands on' experience in the sense of true stick and rudder. You will ordinarily be controlling the wing crow/flap and aileron reflex surfaces via a switch and the two thumb/finger sliders but throws and all the usual relative mixes can be programmed in with the other channels if needed, you don't need to use the throttle for crow but you can if you want to. This is not a radio that will fly the aircraft for you. Some of us love this kind of radio for it's alternative approach to programming and its curious channel mix flexibility, it is wholly unpretentious and does not get in the way of your flying with its complexity.
But I am sorry, it has been a couple of years since I have used it and I have forgotten off hand how to guide you. The manual is very comprehensive and easy enough to follow like most MPX offerings. Perhaps there is an online PDF available. My connection here is to crap just now to have a search for one, but it is probably out there so start with Multiplex's own website.
Stick with it and you will find this a great little radio for full house ships. But the Tx really does benefit from a two cell 2200mAh LiPo instead of the measly 800mAh NiMH's it comes with. If you have the original MPX Synth Rx the radio comes with my advice is to toss it, far away, it has a bad rep and I myself have lost a 3.5 meter TD bird from an Rx lockout. The radio has a programmable timer and alarm which is very useful for TD training.
All the best.