I personally run a Y cable for both on both aircraft that are equipped. The mix is a pain and often difficult to remember how it was done. With the Y cable, it's done. No mixing.

The switch is slaved to channel 5 or 6 so you just go to the channel the switch is slaved to (by default) and plug it in. You can reverse that channel if necessary so that they are flaps rather than spoilers.. but it's as easy as that.

There are people that want the precision of being able to adjust each servo individually, so they want each servo plugged into a specific channel. But for most sport flyers, this is totally unnecessary AND it takes up a lot of slots on your RX. Current draw is the same no matter how you set it up because you are still controlling a number of servo's no matter how you do it. And, you can do most of it with the linkage and end point adjustments no matter how you do it. You know.. KISS.. Keep It Simple Stupid.. seems to be my slogan of the day here..

CGr.