Make cells able to overflow
The text in a cell can wrap, shrink or, as per default, overflow the cell edge. And when double-clicking the edge of the column header to make the column set to auto-width, if the cell is not wrapping or shrinking the column width will expand to contain the whole text.
In some cases, I'd like the text to keep overflowing even though the text is larger than the column width. A kind of "ignore when determining column width"-setting. It would probably fit best at the same place as the wrap/shrink setting.
I would use it for constructs like a list of checks:
x with an extra comment
This would be one way to do this without having to hover the mouse pointer to see the comment, but I am sure there could be other usages for it as well.