Menu, ContextMenu, TabStrip, PanelBar, Splitter have append, insertAfter and insertBefore methods.
kendoToolBar has only add, so there is no way to insert new command after/before other command.

Please add methods insertAfter and insertBefore to the kendo.ui.ToolBar widget.

Related forum post:
http://www.telerik.com/forums/insert-item-at-the-beginning