Sorry for delay. I have tested next configuration which allows to get your wish. I taken Wordpress and Debian 7 for tests.
0) Unpack Wordpress to /var/www/vhosts/wordpress and `chown www-data:www-data -R /var/www/vhosts/wordpress`
1) Create service plan with modified PHP settings: add '/var/www/vhosts/wordpress' to include path and open base dir.
2) Create custom vhost configs (http://download1.parallels.com/Ples...linux-advanced-administration-guide/68693.htm) and modify them:
/usr/local/psa/admin/conf/templates/custom/domain/domainVirtualHost.php:
40: DocumentRoot "/var/www/vhosts/wordpress"
153: <Directory /var/www/vhosts/wordpress/>
171: 'dir' => "/var/www/vhosts/wordpress/",
/usr/local/psa/admin/conf/templates/custom/domain/nginxDomainVirtualHost.php
58: root "/var/www/vhosts/wordpress/";
72: alias "/var/www/vhosts/wordpress/";
3) Create few subscriptions and check result
Plesk shows wrong web roots and customers do not have access to Wordpress files. You can setup 'Custom view' for you customers to hide some confusing items (http://download1.parallels.com/Plesk/PP12/12.0/Doc/en-US/online/plesk-administrator-guide/70035.htm)
All my domains show me Wordpress installation wizard. Is it what do you need?
Custom vhost config templates have one problem - you should test it before perform upgrade to next major Plesk version because we can modify default templates.
0) Unpack Wordpress to /var/www/vhosts/wordpress and `chown www-data:www-data -R /var/www/vhosts/wordpress`
1) Create service plan with modified PHP settings: add '/var/www/vhosts/wordpress' to include path and open base dir.
2) Create custom vhost configs (http://download1.parallels.com/Ples...linux-advanced-administration-guide/68693.htm) and modify them:
/usr/local/psa/admin/conf/templates/custom/domain/domainVirtualHost.php:
40: DocumentRoot "/var/www/vhosts/wordpress"
153: <Directory /var/www/vhosts/wordpress/>
171: 'dir' => "/var/www/vhosts/wordpress/",
/usr/local/psa/admin/conf/templates/custom/domain/nginxDomainVirtualHost.php
58: root "/var/www/vhosts/wordpress/";
72: alias "/var/www/vhosts/wordpress/";
3) Create few subscriptions and check result
Plesk shows wrong web roots and customers do not have access to Wordpress files. You can setup 'Custom view' for you customers to hide some confusing items (http://download1.parallels.com/Plesk/PP12/12.0/Doc/en-US/online/plesk-administrator-guide/70035.htm)
All my domains show me Wordpress installation wizard. Is it what do you need?
Custom vhost config templates have one problem - you should test it before perform upgrade to next major Plesk version because we can modify default templates.