Dropdown - Single Value Selection

We like that dropdown column can have a predefined list of values, but it also allows multiple value selections. We need the ability to define a list of values, but only accept the selection of a single value.

We considered using Status or Label column types, but they do not support conditional formatting of the cell.

This seems like a basic feature … and it should be easy to implement. The importance of this is significant as it makes a impact on the easy of use and the automations associated with this column.