Okay I found the answer of my question. perhaps you / your client can use aefer from softaculous which is free.
Aefer is a Remote Installer which can install 148 scripts on various panels including cPanel, Plesk, Direct Admin, etc. by the click of a single button.
Aefer uses FTP to install scripts on the Host Server. Hence Aefer is capable of installing a wide range of scripts included in Softaculous irrespective of the Web Control Panel.
We have covered a wide array of Categories so that everyone could find the required script one would need to power their Web Site. The best part is all scripts in Softaculous are available in Aefer.
or you can use http://www.simplescripts.com/
SimpleScripts is a one-click installer for blogs, photo galleries, forums, and more
But again if Softaculous can work properly with ISPconfig would good too.
or other installer would be great.