I would not recommend doing this to resize columns. I did this in my project at work and it caused filter logic to stop working on the kendo grid. This is due to the fact that calling setOptions rebinds the grid (http://www.telerik.com/forums/loading-grid-options-causes-an-error-when-calling-todatasourceresult).
I would recommend using JQuery and CSS as shown here: http://www.telerik.com/forums/resizing-column-dynamically