I discussed this with our developers and they approved your request. You can track its progress and vote for it here: Public URL
In the meantime, as a workaround, you can try to determine whether the node is expandable or not by verifying whether the arrow next to the node exists or not. Here's an example:
RadTreeView treeView = Pages.ASPNETTreeViewDemo.ContentPlaceHolder1RadTreeView1Div;
HtmlSpan expandArrow = node.Find.ByAttributes<HtmlSpan>(
As you can see in this video
, I'm using the code above to click on all items that are not expandable.
All the best,
the Telerik team