It should be possible to apply missing semantic information to the rendered code of a web application to support handicapped users to get the most possible benefit of the Kendo UI framework.
Closing as we don't have a generic solution for augmenting WAI-ARIA roles of the internal components.
There's no clean way to apply ad-hoc changes to the rendered markup. Angular goes to great lengths to abstract away the DOM and this is likely to remain the case. Our recommendation is to open issues on our bug tracker for each case of missing/wrong semantic information: https://github.com/telerik/kendo-angular/issues