There are number of possibilities here but generally snaps (or tip stalls) on landing are the result of high wing loadings, highly tapered wings, warped wing, or rearward CG. This leaves a few alternatives. Obviously you can't increase the wing area but you can reduce weight wherever possible to improve wing loading. Moving the CG forward will also reduce snapping tendency at low speeds but may reduce maneuverability for the "wilder" maneuvers.

Your friend may be able to move his CG forward a little and increase his throws to compensate. that's what I had to do to my MW Cap232 to get it controllable at low speeds. I also use dual-rates AND plenty of exponential so that I can still slam the sticks to get snappy maneuvers but around neutral the controls are soft. Landings are now a breeze with no tendency to snap.

Another trick I've seen but haven't tried is to use the "flap" TX switch in reverse to flip the ailerons UP somewhat for landing. This has the effect of "washing out" the wingtips making them less likely to stall before the main part of the wing does. This does require mixing in some pitch trim to keep the nose from rising suddenly when it's applied.

Hope this helps some.