I am afraid the described functionality is not available in Kendo UI Pie Chart at present. We will appreciate it if you submit this idea as a feature request at our UserVoice portal - this way the community would be able to evaluate it and if the suggestion gains popularity we will consider its implementation for future versions of the product. The more votes the suggestion collects, the higher priority will have!
the Telerik team
Join us on our journey to create the world's most complete HTML 5 UI Framework - download Kendo UI