switch sends value?

Is it possible to make a switch or knob send a specific starting value? For instance, I’ve got two sets of samples from a mono instrument that I want to be able to mix. I’ve got a slider that mixes between the two sample sets. But, just for fun, it would be nice to have a switch that automatically moved the panning of one set to the left and the other to the right. I know I could just give the user two pan knobs, but I don’t want to use up the screen real estate for something that probably won’t be used that often. I was thinking it would be nice if we could specify a particular value for a parameter, so that you might see something like @id:10:64, where 64 is the value you want when the switch is pushed or a knob in a stack is activated. Is there already a way to do this that I don’t know about in the macro page editor or is this something that needs a script?