We do not have immediate plans for adding such features to Sitefinity, but we have not ruled them out. As for the preferred provider, I can refer you to our implementation partners:
Sitefinity is completely extensible and flexible CMS so I would not expect any of our partners to have problems with implementing the desired solution.
I hope you'll find this information helpful. Let us know if there is anything else we can do for you.
the Telerik team
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