I think I'm picking up what you mean. When I use the |< >| buttons on the steering wheel, it changes the XM station TO THE NEXT PRESET XM STATION. I really wish that it just tuned to the next station in line instead of the presets.
I have no idea if there is a setting you can change or not. I poked around a little when I first bought mine and couldn't find anything in the audio settings.
MAYBE - There are more settings to play with while the ingition is in the ON position (truck not running). Haven't checked that yet.... just thought of it just now, actually. Now I kinda want to sneek out of the office to parking lot just to see.