Available in LIB version 2016.3.1121, it will be also available in the 2017 R1 Release.

When TabStopMode is set to "Skip" on all columns and you press Tab, RadGridView scrolls a little.

Workaround: define a custom KeyboardCommandProvider and clear the pending commands.

Clicking outside the dialog should hide it.

The sort index will not be displayed when applying a custom sorting without adding a SortDescriptor, You can consider implementing Custom Sorting using the IComparable interface instead. As an example please refer to the Custom Sorting with IComparable WPF Demo. Using a generic SortDescriptor would also be an option. 
Please check our online documentation for a further reference: http://docs.telerik.com/devtools/wpf/controls/radgridview/sorting/custom

It does not matter if the button is in a CellTemplate, CellEditTemplate, ControlPanelItem etc.

MergedCellsStyle and MergedCellsStyleSelector properties will be available with Q2 2016.

Right now, if you programmatically increase the RadGridView's font size, the columns get bigger to accommodate. So far, so good. But if you then make the font size smaller, the columns stay the same large-font width. 

Further, double-clicking the gridsplitter that separates the columns after the above procedure doesn't resize the column like it would if you'd manually resized the column and then double-clicking the gridsplitter - instead, nothing happens.

Finally, it would be nice to have a programmatic interface to autosize the columns, something like

MyGrid.Columns(0).AutoSize()

Thanks!

As Windows application use a common clipboard, there is a potential risk for causing a ComInterop exception while copying data from RadGridView. Workaround: Process exceptions in application logic