specifying a specific block template for a particular page

I know you can specify which particular block page template can be used for specific modes in different controllers in :


Currently I have this:

'pages' => 'pages',
'product_features' => array (
'view' => 'categories',

But what about a specific page in a particular controller?

I’d like something like

'pages' => array (
'pages' => array(
'13' => 'categories',
'default' => 'pages'

Where all pages use the ‘pages’ blocks layout, except for page 13, which will use the ‘categories’ block layout.

If I can’t do it there, where is that array parsed so I can specify if $page=13, use something else?