Keep in mind Red that I learned to fly on Single-Channel escapement radios, and Barn door ailerons are a piece of cake with a single servo. All that's needed is to run a flex-rod out to each aileron. As far as differential goes, just connect to the servo as shown.

True, you can't "Dial-In" an exact amount, but if your needs are that critical, you're flying far above the average Sport Flier.

Don't get me wrong, I totally agree with you that there are many functions that a simple 6 channel radio will do to greatly simplify things, and I often recommend them. My only grip is with those people who when asked for ADVICE say something like "You'd better get that top-of-the-line Radio, because someday you're going to NEED it!"

The next thing you know, some poor slob goes out and buys a radio that is WAY over his head and he either can't figure it out, or never will need to figure it out, or in the worst-case senario, he programs some God-awful thing into it that causes a crash.

Edit - Second pic was wrong so I removed it