Hi,
I have OS X 10.7.5 installed on my W530. To get the UniBeast installer to boot I had change the display setting from Optimus to discrete and I may have disabled USB 3.0. After that, I was able to install things normally. I would assume that it is the same way for Mountain Lion.
The W530's Wifi and discrete graphics don't seem to have any support on OS X. I have audio, ethernet, the keyboard, trackpad, and battery meter working. The HD 4000 graphics should work, but I've been having trouble with it.
I hope this helps
-tecnifighter