We just made a change in Crosswalk Beta in XDK to unconditionally disable it. Until we get the next release out in July, we can't add any options to current build, but we will add a control soon after that release.
There were many people reporting that the blacklist was not needed, but no real evidence that the blacklist was preventing crashes. If that turns out to be false, then we will unconditionally disable it again. But I am hoping that we can leave it that way for a few weeks until we give the developer control. Please let us know what your experience is.
Hopefully you guys will provide option to enable or disable the GPU blacklist so that we can choose for stability or high performance. If you hard coded it, I'm worried that somehow we will encountered some stability problem when deployed.