On Wed, Oct 17, 2012 at 6:22 AM, Noam Slomianko <nslomian@redhat.com> wrote:
I stand corrected, it seems that this change is supported.
If you go and check the memory optimisation tab you'll find that it is set to "Custom Value"

I'm not seeing that.  I select my cluster, then click Edit > Memory Optimization, and i just have the 3 radio buttons: None, Server (150%) and Desktop (200%).  Am I looking in the wrong place?  Running a different versions than you are referring to (oVirt Engine Version: 3.1.0-3.19.el6)?