1. Formula selection dragging

2. Formula selection resize

Details: While using cell references in formulas in a cell, user should be able to drag and resize the referenced cell selection.

Refer the video present here for details.
<https://drive.google.com/file/d/0B2aXCYXjjcD9RDZpd0lScEV3UUk/view?usp=sharing>

Ability to dynamically bound the DropDown editor to an array of objects 

It would be nice to have text orientation support (at least vertical) like in MS Office.

Expose a property on the range object of the spreadsheet component which shows whether a range is currently hidden or shown

When typing a formula and selecting another cell in Excel we can press F2 to be able to change the formula manually, however when using the spreadsheet when trying to change the formula with the arrow left or right button we select another cell.

In MS Excel when you type a number you can easily go to other cells by using the arrow keys and type in another number, thus allowing for fast editing of the spreadsheet. This does not work in the spreadsheet component.
this functionality only needs to work when not creating a formula.

add indent property to spreadsheet cells to closer match excel

I have a first example using the Kendo Toolbar widget and I was able to get an Angular button rendered in the toolbar:
http://dojo.telerik.com/ucIfin
When I tried to do the same thing in the Kendo Spreadsheet widget toolbar, it failed to compile my template:
http://dojo.telerik.com/UseWI

In general Angular directives are not compiled properly when specified in the template of a Spreadsheet Toolbar item.  I am aware of a workaround for the kendo-button specific case, but I would like the template to work for custom Angular directives as well.

 add search functionality to the Spreadsheet.

Allow additional control over what a user can undo/redo, or a clearer way to control the undo/redo stack.  

Right now, users cannot undo more complex custom logic - i.e. a user deletes the content of a single cell which triggers code for us to clear the content of every cell in that row.  When a user then attempts a single undo via keyboard shortcut, it cannot undo this more complex chain of events.

When using the bottom right corner of a cell to batch copy values across a range by dragging the corner, an error popup appears if a disabled cell is found inside the range that was dragged into.  It is possible to reproduce this with this demo:

https://demos.telerik.com/kendo-ui/spreadsheet/disabled-cells

1.  Set the quantity column to disabled.

2. Select B3.

3.  Drag the bottom right corner of B3 to D3.

4.  See error: "Destination range contains disabled cells."

There should be an option to allow that to copy into any enabled cells in that range and ignore the disabled ones.

Allowing custom editors to be inline would be very helpful. In particular, inline editors using other Kendo controls (e.g. masked textbox, numeric textbox) should be possible.

Custom editors are great!  But often when you have a custom editor, you want to restrict data entry to only use that editor, and not free-form typing in the cell.  You can prevent free-form typing in the cell by disabling the cell, but then the custom editor button is no longer available.

Suggestion is to still show custom editor button even if cell is disabled, perhaps with an additional setting; so that you could optionally not show the custom editor if the cell is disabled, since often a disabled cell should prevent any kind of modification.

Currently the spreadsheet dynamically creates the FilterMenu for a range, that is, it's not created until someone clicks the filter dropdown, and it's destroyed if they switched tabs.

There is no event that is fired when these things happen, which makes it hard to attach to, and customize, the FilterMenu without setting up some crazy listening code (setTimeout, etc.). 

It would be great if either (or both:
- You could specify a template for the filter menu.
- You could listen for a "FilterMenu Initialized" event and capture the menu there and customize it.

Add ability to add group multiple columns and add a group header for those columns.

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

By default the items in filter are in random order. Can we sort the items in ascending order by default.

The current context menu lets you hide a row or column, but then you cannot show it again, so the user can lose data. At present there is no context menu option to unhide it and there is no element indicating the column/row was there in the first place. This should behave like in Excel.

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

Currently if you access cells range programmatically, you can set background color, text color etc.
It would be good to have the way to set classes or to get the DOM of the range.
Another option would be to get DOM or set a class to individual cells (e.g. via range.forEachCell).