Thank you for your reply, it seems like most mac users with Razer mice use the mouse acceleration. I personally think it's awful but yeah, not everyone is the same. Well, I found a solution. When I delete the razerhid.kext and restart my mac, the default sensitivity will be the last sensitivity stage I used on Synapse, 2800 Dpi in my case, but clicking on the Dpi buttons will change to the default dpi stages: (800,1800,4500,9000,16k). It's not optimal but hey, it works. I love my Razer mouse so far but yeah, Synapse is just awful on a Mac. Fortunately I won't use it for too long on my Macbook Pro. Saving for a tower atm.