Being able to merge rows only or columns only within a selection.
On selecting a set of cells (multiple rows and columns), having the ability to merge all of the cells in each row or each column would be useful.
I have to do this when setting up table headings. Where the headings may have a master and sub heading for some columns, the rest I have to select and merge cells in all of the other columns one column after another to get this affect, so that centering in height or width then looks better,

1 comment
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Mike McClory commented
Spreadsheet to show concept