Its not easy to just add a custom column tag, as the column tags don't actually render the value, they just tell the table what columns should be rendered and the table tags does the actually rendering.
Therefore, the easiest way is to modify the table tag as follows:
- copy table.tagx to tableCustom.tagx
- add extra custom column to tableCustom, based on the "update" column
- modify any views that need to use this new column to use tableCustom
The reason for copying the tag is that it allows you to update the roo tags when a new version of spring roo is released, without losing your changes.