Thanks Eugenio, I was thinking the details page, but the results grid would also be useful.
The reason this would be useful is that I have a few views that share a common id with some common tables, and I would like to create a button that could be located on a table detail page that would generate a pdf based on the view with the same id (rather than go to the view and use the existing pdf generator).
I'm very happy with the additional features of Monterosso by the way!
Make sure custom buttons are enable by setting $enable_custom_button_functions = 1 in include/config.php, then you need to set up a custom button following the instructions in include/custom_functions.php. In the example below, I passed the table name, $where_value, template name etc into the html header.