Addon Questions
 

Does ISPConfig have it's own Addons Scripting like Cpanels Addon Scripts?

Also if so is there Addon Scripting is there and good documents on the subject?

I am mainly looking at scripts to automatic install of open source content management system like xoops and forums like phpbb for clients to install.

No, there's no such add-on, but you might want to have a look here: http://www.howtoforge.com/forums/showthread.php?t=1810