Here's the way I like to set mine up: Aileron stick controls rudder, so elevator/rudder on the same stick (right stick for mode 2), and the throttle to control the spoilers.

I prefer to hook my spoilers up directly on a single servo to both open and close - not rely on a rubberband to close them. A bit more complex with bellcranks, but I like to have positive control over them. Some spoilers, when the rubberband return gets weak, can lift up a bit on their own and possibly spoil some lift. With direct servo contol that will only happen with a servo failure.

I know some who use a toggle switch or rotary switch for their spoilers, but I find the throttle stick easier. I've seen some guys with 2-meter gliders use the Hitec Focus 3 radio - the gimbal for rudder/elevator and the slider switch on the back for spoilers.

Hogflyer