Add image saving capabilities to the Workbook. Currently, you load (through the Workbook's Load method) an Excel file that contains images, and when you save it, it is saved without the images.

The FromJson method of Telerik.Web.Spreadsheet.Workbook doesn't add images when a JSON containing an image blob is passed to it. 

It would be nice if the FromJson method supports images.

We have clients with large spreadsheets that print out across multiple pages, which can mean losing track of which column refers to what on new pages after a page break, so they want to be able to assign a row of column headers to be printed on new pages above each column to keep track

I think it might be very useful to add to cell comments an HTML code and be able to do it programmatically.

Thank you

total row count should display on footer like in excel , row count should change after each filter , also option for to add "action link" to the columns so that we can navigate/popup to other pages..

It would be great to be able to put buttons inside a cell or merged cell for atomic functionality. 
Actually I would really need it for a project we are working on at our company.

Spreadsheet import currently handles (keeps) rich text formatting of a cell if the entire cell is formatted, such as a colored row or all bold text in cell. However, if the content of the cell is a mix of plain text and formatted text, the formatting gets dropped on import. If it is possible, it would be nice to keep rich text under this condition.

How to add Superscript, Subscript HTML Entities to Kendo Spreadsheet Cell Data

Can we have a facility to copy a cell and paste it to a selection. (i.e paste to multiple cells)