Channel Specific Curve Points - Picker Tool

Hey all,
I've noticed that the Curve Point Picker tool only seems to add points to the RGB curve, not to the currently selected colour channel.

Is there any way to use the picker tool to place a point on the curve in, say, the G channel if you have the G channel selected? I can't for the life of me figure it out, but intuitively I figured that should have been the default behaviour.