I would like a "Stack properties" checkbox added to the Stack command.
The result should be that each property in the stacked columns (where feasible) creates a column with that property name. Each row of these property columns contain the original properties of the stacked columns.
This would make the stack command more complete, as currently most of the properties are lost when stacking columns. This ways the properties could still be made available when going from wide to narrow format.
The split command could have similar (opposite) functionality, i.e. a number of columns could be added to a property columns list, and when splitting the contents are added to the properties of the created columns.