The feature is going to be included in the next official release Q3 2014.
Here is a link to the pending issue concerning non-breaking spaces: http://feedback.telerik.com/Project/143/Feedback/Details/141642-paragraph-containing-only-non-breaking-space-is-not-imported-from-html. Hopefully, we will be able to resolve it for one of our next releases.
This is not fixed in Q3 2014.