Complete Installation - allow 10 to 30 minutes.
Your presence is not required after the Restart step (5 minutes or so.)
The complete installation adds:

- assorted tools, scripts and daemons (prefixed with _bSE_)
  which will allow iFuntastic (and you) to run code on the device
- a bSE folder in /private/var/mobile/Media/ to hold most other iFuntastic support files
  and placeholder web clips to allow gaps between applications on the Home Screen

It will also create a File and Folder index and make an application list.
In addition it will:

- install the HideClock font so you can make the lock screen time display invisible
- install the Emoji keyboard setting
- build the text index for searching within text files
- build an iTunes library index to list songs with artist and title if possible
- copy the archive of UI images to disk for additional theming with WinterBoard
- build the image cache for thumbnails
- build the Graphinder files and Graphinder theme for easy identification of graphics

To the best of my knowledge these additions will not interfere with existing installations and features. Please let me know if you do have any problems.