As there isnt a pure spreadsheet control, adding this function will allow users to still make changes in excel but visualize it in the app.
We'll rather research the option to implement Spreadsheet UI component/solution in the second half of 2015, Cheong. Stay tuned for updates later in the year. Update: This functionality is available in the new spreadsheet component: http://demos.telerik.com/kendo-ui/spreadsheet/index
We'll have this feedback in mind when developing the features of the new spreadsheet component, Darshan.
Over the years, the request to allow data pasting from Excel to our grid-based solutions has come up repeatedly. It comes up in every demo, especially since may users have experienced this capability in other web-based UIs (including SharePoint). In the past, where important, I have implemented this capability using web-based uploads, but a paste feature would be a much better solution. Ideally there'd be row-based events (before / after update) or single events which passes a row collection for custom tweaking. But in cases where the data shapes match, it would be a great feature.