Provide built-in border tools for customizing the appearance of the cell borders. A similar feature is already available in the Kendo jQuery Spreadsheet:

Allow creating custom toolbar tools in Spreadsheet.

Allow the developer to customize the built-in Toolbar actions in Spreadsheet. Provide the ability to reorder or show only part of them:

Provide a readonly property to prevent the user from interacting with the data inside. 

Consider allowing the user to download the sheet.