RE:  Reverse Differential for landing without landing mode on a 9303

I've got a general question on how to program 'special' mixes on a JR 9303.  
This question probably applies to other makes as well.

I don't use a landing mode on a 4 servo DLG.  I would like to have reverse 
differential for landing with the flaperons down (45 degrees) so that the down 
flaperons don't go down further with steering input since they are near their 
stops, plus the downward going flaperon doesn't do much good for steering 
anyway.

This would be simple with landing mode, but I can't remember to flip that 
switch.  Airtronics could do it with the 'stick switch' in the flap stick.  I 
think it could be added with mixes, but can't figure out how.

I would like to mix in up aileron to the down going flaperon in PROPORTION to 
the SUM of the flap stick and aileron stick travel.  No flap stick travel, no 
mix, no aileron stick movement, no mix.
How do you compound (multiple?) mixes to get an action proportional to the sum 
of 2 inputs?  I believe it is possible but can't conceive of how without a AND 
OR function.

What am I missing?

Thanks,
John from Denver

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