I use the G15 on my Mac and it works fine. I tried this last night and followed the instructions and it worked out great. Of course I sat there and watched for a while, just to make sure nothing bad would happen.
I did this and always left it on very long, just got voted out of the bg's couple of times, works very good, I just use another way: with addons and macros on g15, more simple but this works too.
nice one, deff gonna try it when i get my new mouse!! d: