Allow arbitrary text and placeholders in datagrid cells
Currently each placeholder object in a datagrid is limited to the value it represents. Still, placeholders can be copied and used multiple times, and distributed across different columns.
Even more useful than this would be the option to alter the text of a placeholder object to incorporate custom text as well as other placeholders. These could then be replaced during simulation.
"This is the [TestData.id]. entry, by [TestData.author]"
"This is the 3. entry, by John Doe"
The (less handy, but possibly more flexible) alternative would be a text function replace().