Naga Pro and horizontal scroll in onboard memory

I have a Naga Trinity that I quite like, but there is one thing that kind of bugged me a tiny bit. With Synapse running, I can assign scroll left/right to the tilt wheel (or other buttons, actually), and they worked okay. However, it cannot be saved to the onboard memory. It won't work also, if you closed the synapse. A bit of background: I work mostly on a Mac, so I have to configure everything on Windows and save to onboard memory. I am a tiny bit spoiled by touchpads, having the ability to scroll in all direction and gesture controls (which I bind to the Naga's buttons) do help a bit with productivity. I am hoping that the Naga Pro could finally do horizontal scrolling from onboard memory. Had anyone tried assigning horizontal scroll to onboard memory on the Naga Pro? I can't find a store that have the mouse hooked to a computer to test it out where I live (wondered if there are shops who do this elsewhere in the world). The price is a bit steep, so I am hoping if someone could confirm if this works :) p.s.: On Mac, if you press shift key and then scroll, you would be scrolling horizontally. As a workaround, I have the shift key binded to a button. I was wondering if the tilt wheel could natively support horizontal scroll