Hello, 

Thanks for the idea. We are thinking about supporting cgroups in future. But for now it is not at nearest roadmap. We'll keep an eye on the feature voting.

Seconded on this. With this feature, it also can be easier for you to develop a user based resource monitoring. These are the features that we lack and actually need for a web hoster.

For me CGroups are quite important, as you could limit a single website usage. 
I would love to see it directly with Ubuntu without the usage of cloud linux.