Oh, well that's a real shame.
I bought a proteus core and loved the tracking, going back to optical from laser feels so much nicer but the Logitech shape was just awful for me. Way to high a back so the zowie seemed to be the perfect solution. Great sensor right shape but no dpi on the fly is a deal breaker.
Can i ask why you want on the fly dpi switching, in all my years of pc gaming i have never used it once seems a gimmick.
Set your dpi change in game sensitivity.
That doesn't apply to all games. If I se the dpi low in BF4 for aiming down sights that's fine, set it high for vehicles it's fine when driving around but it's too high when aiming from a vehicle when zoomed in. DPI switching to a low dpi when zoomed in from a tank etc gives far greater control.