on the F-22, that setup is also more effective than standard speed brakes. You may find that just splitting the rudders is plenty. that will take two mixes. One slaved to the slider, one to the other with reversal. Its easy to run out of mixes. You may need to set it to go away at full throttle. Guys that split the rudders on Rookies have a similar setup, so someone can help there. If you want the crow/rud mix for sure. set up the crow first and then use a combo of switches to get what you want..

I had put some thought into it awhile back and figured it out on the 12x...