Customise modal content

Not currently, but we can add hooks! Will let you know when it’s integrated.

Aloha, version 3.6.0 should include the filters you need for your customizations.

insert_pages_available_templates:
https://github.com/uhm-coe/insert-pages/commit/ef9b2d273ef00ef91879cc98301446ce8f7ab35e
Example:

add_filter( 'insert_pages_available_templates', function ( $templates ) {
	// Remove unnecessary theme template from Insert Pages modal.
	unset( $templates['your-unwanted-template.php'] );

	return $templates;
}, 10, 1 );

insert_pages_tinymce_state:
https://github.com/uhm-coe/insert-pages/commit/35053c8d842e5506c4446d83ad6e5dfb39e76528
Example:

add_filter( 'insert_pages_tinymce_state', function ( $tinymce_state ) {
	// Default to always use a custom template.
	$tinymce_state['format']   = 'template';
	$tinymce_state['template'] = 'your-custom-template.php';

	// Hide the querystring and anonymous users options.
	$tinymce_state['hide_querystring'] = true;
	$tinymce_state['hide_public']      = true;

	return $tinymce_state;	
}, 10, 1 );

Let us know if you run into any problems. Cheers!

Thanks!