[capink]

@chaley: The chain variables action already has a column (the value column) that accepts templates as value. I am thinking about adding the new functionality to this action; by adding a third column with a checkbox. When checked, the template will iterate over all books. I will also make right clicking the value cell pop up the template dialog.

I think that way you can, if you choose, skip the set_globals part because the new value will be automatically re-assigned to the named variable (the name column). Any thoughts?

Edit: set_global would still be used if a user wants to set more than one variable, as in your previous example, but must be sure to choose a different identifier in the chains variable name column.