[Feature Request] Filter For Admin Menu Capabilities

I would like to see in the future of this plugin a filter for changing the add_submenu_page capabilities. Currently 3 of them are hardcoded as administrator with no easy way to change this. Something like this maybe:

add_submenu_page(
	'wsdesk_tickets',
	'E-Mail',
	esc_html__('E-Mail', 'wsdesk'),
	apply_filters( 'wsdesk_email_subpage_cap', 'administrator' ),
	'wsdesk_email',
	array( $this->settings, 'eh_crm_email_sub_menu_callback' )
);