4strips not sure what the pics are illustrating. This is a non washed wing with flapperons deployed and what an aileron moving slightly. Watch any video approaches and you'll see the tailerons kick in most of the roll corrections as I originally pointed out.

Maybe this is where we are mixing the thinking. I'm saying flapperons do not cause a stall but I think you are trying to show concern of maintaining roll control via the ailerons discussing wash etc. Note I originally said not to reduce roll authority with flapperons unless he adds tailerons.

For the F35A like the SU-27 family, they have large flapperons where the tailerons maintain much of the attitude controls.
http://www.youtube.com/watch?v=tIXS9...embedded#at=49
I've done the same for both my Freewing and Laxiang F-35 and it flies a much more stable approach with the flapperons.

No need to pick at word since I said, "as you describe" and "mainly". An aircraft of this designed isn't flown into a controlled stall at slow speed and if they do, the controls change to ailerons becoming spoilers and the tailerons are greatly loaded. For an aircraft like the CF-415 that has flapperons, but never see great speed ranges, neither wash or tailerons are needed. But where modern fighters experience high pitching moments (look it up), is more so at velocity. Wash helps both the pitching moment and aileron control, where the later if lost is loaded to the taileron as mentioned before. Thus my mainly comment.

The OP will be fine with flapperons as many have demonstrated, as long as he maintains his roll control via the tailerons.