OK, how about a decent quotable source?

Mike McConville on "Flying the FuntanaS 3D .40" says:

"I've played around with using coupled spoilerons for several years to enhance the 3D capability of some models.

I have always used a coupled flap mix in my transmitter to do this, so when I flip the switch on my transmitter, the spoilerons move whenever I move the elevator stick. (elevator up, ailerons up and vice versa). Sometimes this isn't beneficial when making small elevator movements, but it does help when you get to "3D" deflections of around 40 degrees.

Then Seba clued me in on the setup he uses. Instead of using a flap mix, you have to use a curve type mix like you find in the JR 8103 and 10X systems. Set the elevator channel at the master, and the flap as the slave (you're already using flapperon mix for the two aileron servos, right). Set a curve so the ailerons don't move until the elevator stick is about 75% toward the stop in each direction….. "Snap-spoilerons." This allows you to turn on the mix yet have no spoileron movement until you really need it. On the FuntanaS, this really helps some maneuvers look much better and more controlled."
---------------------------------------------------------------------------------------------------------------------------

So there you go, you are not using flaperons, you are using "coupled spoilerons". If you're really clever you might even be using "Snap-spoilerons"

You can find a whole series of 3D articles on the HH site....