Possibility to add filters to hierarchical datasource, that execute recursively. Use case: In TreeView we need to search for some element text, we need to see elements that contain some text and their parents expanded. Filtering could be usefull here.
Shipped in R2 2017 - http://docs.telerik.com/kendo-ui/api/javascript/data/hierarchicaldatasource#configuration-filter
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+1 for recursive filters. Of course the filtering should not only be read-only, but also allow you to change node properties (e.g. selected state, text shown, visibility). the current "solution" (checkedNodeIds function in http://demos.kendoui.com/web/treeview/checkboxes.html) feels quite hacky and has some pitfalls if you want to change/remove nodes. js-traverse (https://github.com/substack/js-traverse) could be some source of inspiration.
We need that too. Or a possible work around.