Thank you for your feedback and sorry for the late reply. We think that Outliner would really be a great feature. We are need, however, to discuss first whether and when we are going to implement it.
There is indeed a PITS item for it where you can follow its progress: http://www.telerik.com/support/pits.aspx#/details/Issue=6444
If you have any more questions or remarks, please do not hesitate to contact us again!
All the best,
the Telerik team
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