Is there a way to assign DPI switch to the Superlight 2 without getting rid of the other buttons main functions?

I really like the Superlight 2, but the only thing I hate about it is that it doesn't have a dedicated DPI button. I want to assign DPI cycle to a button or combination of buttons without getting rid of the main function of buttons. Like I tried setting my back thumb button to GShift and the DPI cycle to the scroll wheel button, but that removes the "back page" function from the thumb button. I could technically reassign back page to mouse 1 or 2 while holding down GShift, but it makes it so that I can't use the thumb button at all in games. Anyone have a solution for this?