Preinstalled scripts are very common. So common, in fact, that it's almost the norm. cPanel uses Fantasico as well as a cPanel plugin and there's Installatron (I think that's the correct spelling) for Direct Admin. Each will install various forums, blogs, ecommerce, and CMS's.

Keep in mind that I am making no statement for or against the company you mention. I'm merely letting you know that this is a very common feature.