Conditional formatting cell width
Allow conditional formatting to be applied so that cell widths and heights can be specified.
Laura Timmel commented
I suspect that this would require a major reworking of Conditional Formatting, I'd think. Currently, it operates on a cell-by-cell basis, but for this feature, it would need an additional option to target entire rows or columns instead. Given Microsoft's slow response time and apparent negligence when it comes to Conditional Formatting, I seriously doubt that this kind of core overhaul will ever happen, but it could be incredibly useful--and not just for width/height.