Hey Hoof Hearted,
to answer your question concerning BlueSpice. BlueSpice is based on MediaWiki that's true, but it's a distribution. So it is more than an extension because big feature developments ar integrated, beginning with a WYSIWYG-Editor, a facet search, administration interface, changed design (usability changes) and more. So if wiki engine hints at technical functions than it's not a MediaWiki. If just the core is the fact that matters, than MediaWiki is correct. However "hosted on BlueSpice" is not exactely correct ;) An example of an other software area: Linux to Suse (MediaWiki to BlueSpice).
Hope I could help you