I'm actually using SteerMouse with the Elecom because it doesn't have first-party Mac drivers. I never did try it with the G700s - I was already through with that based on the battery life. But it may have helped. (I am guessing, though, that even if it could handle all the buttons it wouldn't support the DPI switching on the G700s.)
Might be able to set the DPI switching stuff with its on device memory, set the rest of the buttons as generic mouse buttons, and then use it with SteerMouse.
Would require temporary use of the official software to set this up.
But if battery life was the problem it wouldn’t fix that. I use mine at my desk so I just plug it in and don’t have that issue.
