seperate capabilities for seperate custom post type

In terms of getting things set for the post type arguments, we admittedly don’t have UI built in for that. However, we do have this filter available https://github.com/WebDevStudios/custom-post-type-ui/blob/1.12.1/custom-post-type-ui.php#L538-L550 that would allow you to set them right before registration.

It’s all in the same format as you would see in examples from https://developer.ww.wp.xz.cn/reference/functions/register_post_type/#capability_type and specifically the capabilities/capability type section linked here.

Regarding necessarily how to best go about that, I don’t have a great answer, as I haven’t done a huge amount of roles/capabilities work, so I don’t know best how to address.

Something similar like this would do. Note that I believe the plural version may be based on slug, and not necessarily the label. You’ll want to double check those parts, so don’t take this as for sure would work here. It’s meant as an example of how to add arguments to the register_post_type array we construct.

function cptui_support_filter_post_type( $args, $post_type_slug, $post_type_settings ) {
	if ( 'testimonial' !== $post_type_slug ) {
		return $args;
	}

	$args['capabilities'] => array(
		'edit_post'          => 'edit_testimonial', 
		'read_post'          => 'read_testimonial', 
		'delete_post'        => 'delete_testimonial', 
		'edit_posts'         => 'edit_testimonials', 
		'edit_others_posts'  => 'edit_others_testimonials', 
		'publish_posts'      => 'publish_testimonials',       
		'read_private_posts' => 'read_private_testimonials', 
		'create_posts'       => 'edit_testimonials', 
	);

	return $args;
}
add_filter( 'cptui_pre_register_post_type', 'cptui_support_filter_post_type', 10, 3 );

oops, that should be just an =.

I may or may not have had the code above to be an exact match for what you need, but it was meant to be an example of how to get the capabilities section into the final arguments for usage with CPTUI, without having to take the entire registration out of CPTUI. You may need to make some tweaks and adjustments for the actual capabilities to match.