A possible solution into forcing integrated graphics with VMware Fusion 5.x on OS X 10.8.x Mountain Lion: http://mihail.stoynov.com/2013/02/15/force-integrated-graphics-on-vmware-fusion-and-probably-other-apps-on-os-x-10-8-mountain-lion-avoid-discrete-graphics/
Awesome! This made me drop from 80-99 celcius to 40-50
VMware Fusion 6 seemed more smooth for me and more responsive than Parallels Desktop 9 - and the Parallels Desktop can't use the dedicated card anyways it's seems.